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21008132 = 225252033
BaseRepresentation
bin101000000100…
…0111100000100
31110112022201222
41100020330010
520334230012
62030135512
7343365125
oct120107404
943468658
1021008132
11109497a2
127051598
134477262
142b0c04c
151c9e972
hex1408f04

21008132 has 6 divisors (see below), whose sum is σ = 36764238. Its totient is φ = 10504064.

The previous prime is 21008083. The next prime is 21008149. The reversal of 21008132 is 23180012.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 4734976 = 4034^2 + 2176^2 .

It is a super-2 number, since 2×210081322 = 882683220258848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21008132.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626013 + ... + 2626020.

It is an arithmetic number, because the mean of its divisors is an integer number (6127373).

Almost surely, 221008132 is an apocalyptic number.

It is an amenable number.

21008132 is a deficient number, since it is larger than the sum of its proper divisors (15756106).

21008132 is a wasteful number, since it uses less digits than its factorization.

21008132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252037 (or 5252035 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21008132 is about 4583.4628830176. The cubic root of 21008132 is about 275.9280250604.

Adding to 21008132 its reverse (23180012), we get a palindrome (44188144).

The spelling of 21008132 in words is "twenty-one million, eight thousand, one hundred thirty-two".

Divisors: 1 2 4 5252033 10504066 21008132