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21604412 = 2210635081
BaseRepresentation
bin101001001101…
…0100000111100
31111122121200102
41102122200330
521012320122
62051020232
7351430424
oct122324074
944577612
1021604412
1111216795
12729a678
13462579b
142c25484
151d6b492
hex149a83c

21604412 has 12 divisors (see below), whose sum is σ = 37850736. Its totient is φ = 10789920.

The previous prime is 21604397. The next prime is 21604421. The reversal of 21604412 is 21440612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 6792.

It is an arithmetic number, because the mean of its divisors is an integer number (3154228).

Almost surely, 221604412 is an apocalyptic number.

It is an amenable number.

21604412 is a deficient number, since it is larger than the sum of its proper divisors (16246324).

21604412 is a wasteful number, since it uses less digits than its factorization.

21604412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6148 (or 6146 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21604412 is about 4648.0546468388. The cubic root of 21604412 is about 278.5142904758.

The spelling of 21604412 in words is "twenty-one million, six hundred four thousand, four hundred twelve".

Divisors: 1 2 4 1063 2126 4252 5081 10162 20324 5401103 10802206 21604412