21353908932 has 48 divisors (see below), whose sum is σ = 57147865600. Its totient is φ = 6888356640.

The previous prime is 21353908931. The next prime is 21353908957. The reversal of 21353908932 is 23980935312.

21353908932 is a `hidden beast` number, since 2 + 1 + 3 + 539 + 0 + 89 + 32 = 666.

It is a super-2 number, since 2×21353908932² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21353908931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3185707 + ... + 3192402.

Almost surely, 2^21353908932 is an apocalyptic number.

It is an amenable number.

21353908932 is an abundant number, since it is smaller than the sum of its proper divisors (35793956668).

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

21353908932 is a wasteful number, since it uses less digits than its factorization.

21353908932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6378153 (or 6378145 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 21353908932 in words is "twenty-one billion, three hundred fifty-three million, nine hundred eight thousand, nine hundred thirty-two".