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1200210121000 = 235311154970439
BaseRepresentation
bin10001011101110010000…
…110010001000100101000
311020201221201002100210201
4101131302012101010220
5124131012242333000
62315211404121544
7152466216462502
oct21356206210450
94221851070721
101200210121000
11423008362110
12174737b362b4
1389243ca6967
144213a3c2d72
152134839396a
hex11772191128

1200210121000 has 128 divisors (see below), whose sum is σ = 3065830560000. Its totient is φ = 436152096000.

The previous prime is 1200210120973. The next prime is 1200210121009. The reversal of 1200210121000 is 1210120021.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1200210121009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17003781 + ... + 17074219.

It is an arithmetic number, because the mean of its divisors is an integer number (23951801250).

Almost surely, 21200210121000 is an apocalyptic number.

1200210121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200210121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1532915280000).

1200210121000 is an abundant number, since it is smaller than the sum of its proper divisors (1865620439000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1200210121000 is a wasteful number, since it uses less digits than its factorization.

1200210121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72020 (or 72006 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1200210121000 its reverse (1210120021), we get a palindrome (1201420241021).

The spelling of 1200210121000 in words is "one trillion, two hundred billion, two hundred ten million, one hundred twenty-one thousand".

Divisors: 1 2 4 5 8 10 11 20 22 25 40 44 50 55 88 100 110 125 200 220 250 275 440 500 550 1000 1100 1375 1549 2200 2750 3098 5500 6196 7745 11000 12392 15490 17039 30980 34078 38725 61960 68156 70439 77450 85195 136312 140878 154900 170390 193625 281756 309800 340780 352195 387250 425975 563512 681560 704390 774500 774829 851950 1408780 1549000 1549658 1703900 1760975 2129875 2817560 3099316 3407800 3521950 3874145 4259750 6198632 7043900 7748290 8519500 8804875 14087800 15496580 17039000 17609750 19370725 30993160 35219500 38741450 70439000 77482900 96853625 109110011 154965800 193707250 218220022 387414500 436440044 545550055 774829000 872880088 1091100110 1200210121 2182200220 2400420242 2727750275 4364400440 4800840484 5455500550 6001050605 9601680968 10911001100 12002101210 13638751375 21822002200 24004202420 27277502750 30005253025 48008404840 54555005500 60010506050 109110011000 120021012100 150026265125 240042024200 300052530250 600105060500 1200210121000