21715690932 has 36 divisors (see below), whose sum is σ = 59114937700. Its totient is φ = 6681750912.

The previous prime is 21715690897. The next prime is 21715690943. The reversal of 21715690932 is 23909651712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2868245136 + 18847445796 = 53556^2 + 137286^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 23200057 + ... + 23200992.

Almost surely, 2^21715690932 is an apocalyptic number.

It is an amenable number.

21715690932 is an abundant number, since it is smaller than the sum of its proper divisors (37399246768).

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

21715690932 is a wasteful number, since it uses less digits than its factorization.

21715690932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46401072 (or 46401067 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 21715690932 in words is "twenty-one billion, seven hundred fifteen million, six hundred ninety thousand, nine hundred thirty-two".