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10121220 = 2233518743
BaseRepresentation
bin100110100111…
…000000000100
3201001012201000
4212213000010
510042334340
61000533300
7152012634
oct46470004
921035630
1010121220
11579324a
123481230
132134ab5
1414b66c4
15d4dd30
hex9a7004

10121220 has 48 divisors (see below), whose sum is σ = 31489920. Its totient is φ = 2698848.

The previous prime is 10121183. The next prime is 10121233. The reversal of 10121220 is 2212101.

Adding to 10121220 its reverse (2212101), we get a palindrome (12333321).

It can be divided in two parts, 101 and 21220, that added together give a triangular number (21321 = T206).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8832 + ... + 9911.

It is an arithmetic number, because the mean of its divisors is an integer number (656040).

Almost surely, 210121220 is an apocalyptic number.

10121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10121220 is an abundant number, since it is smaller than the sum of its proper divisors (21368700).

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

10121220 is a wasteful number, since it uses less digits than its factorization.

10121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18761 (or 18753 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 10121220 is about 3181.3864901957. The cubic root of 10121220 is about 216.3105102031.

The spelling of 10121220 in words is "ten million, one hundred twenty-one thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 54 60 90 108 135 180 270 540 18743 37486 56229 74972 93715 112458 168687 187430 224916 281145 337374 374860 506061 562290 674748 843435 1012122 1124580 1686870 2024244 2530305 3373740 5060610 10121220