21091009032 has 48 divisors (see below), whose sum is σ = 57179316480. Its totient is φ = 7023218400.

The previous prime is 21091009007. The next prime is 21091009057. The reversal of 21091009032 is 23090019012.

It is an interprime number because it is at equal distance from previous prime (21091009007) and next prime (21091009057).

It is a junction number, because it is equal to n+sod(n) for n = 21091008987 and 21091009005.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76444 + ... + 219147.

It is an arithmetic number, because the mean of its divisors is an integer number (1191235760).

Almost surely, 2^21091009032 is an apocalyptic number.

It is an amenable number.

21091009032 is an abundant number, since it is smaller than the sum of its proper divisors (36088307448).

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

21091009032 is a wasteful number, since it uses less digits than its factorization.

21091009032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296594 (or 296587 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 21091009032 in words is "twenty-one billion, ninety-one million, nine thousand, thirty-two".