21705604632 has 48 divisors (see below), whose sum is σ = 58830771480. Its totient is φ = 7229692800.

The previous prime is 21705604621. The next prime is 21705604639. The reversal of 21705604632 is 23640650712.

21705604632 is a `hidden beast` number, since 2 + 17 + 0 + 5 + 6 + 0 + 4 + 632 = 666.

It is a super-2 number, since 2×21705604632² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21705604639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18994 + ... + 209217.

Almost surely, 2^21705604632 is an apocalyptic number.

It is an amenable number.

21705604632 is an abundant number, since it is smaller than the sum of its proper divisors (37125166848).

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

21705604632 is a wasteful number, since it uses less digits than its factorization.

21705604632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229544 (or 229537 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 21705604632 in words is "twenty-one billion, seven hundred five million, six hundred four thousand, six hundred thirty-two".