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21013300 = 22527112729
BaseRepresentation
bin101000000101…
…0001100110100
31110112120211101
41100022030310
520334411200
62030215444
7343416160
oct120121464
943476741
1021013300
1110952670
127054584
134479709
142b0dca0
151ca126a
hex140a334

21013300 has 72 divisors (see below), whose sum is σ = 56871360. Its totient is φ = 6547200.

The previous prime is 21013273. The next prime is 21013301. The reversal of 21013300 is 331012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6336 + ... + 9064.

It is an arithmetic number, because the mean of its divisors is an integer number (789880).

Almost surely, 221013300 is an apocalyptic number.

21013300 is a gapful number since it is divisible by the number (20) 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 21013300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28435680).

21013300 is an abundant number, since it is smaller than the sum of its proper divisors (35858060).

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

21013300 is a wasteful number, since it uses less digits than its factorization.

21013300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21013300 is about 4584.0266142334. The cubic root of 21013300 is about 275.9506493013.

Adding to 21013300 its reverse (331012), we get a palindrome (21344312).

The spelling of 21013300 in words is "twenty-one million, thirteen thousand, three hundred".

Divisors: 1 2 4 5 7 10 11 14 20 22 25 28 35 44 50 55 70 77 100 110 140 154 175 220 275 308 350 385 550 700 770 1100 1540 1925 2729 3850 5458 7700 10916 13645 19103 27290 30019 38206 54580 60038 68225 76412 95515 120076 136450 150095 191030 210133 272900 300190 382060 420266 477575 600380 750475 840532 955150 1050665 1500950 1910300 2101330 3001900 4202660 5253325 10506650 21013300