21017524992 has 72 divisors (see below), whose sum is σ = 57449162736. Its totient is φ = 6816485376.

The previous prime is 21017524963. The next prime is 21017524999. The reversal of 21017524992 is 29942571012.

It is not an unprimeable number, because it can be changed into a prime (21017524999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341403 + ... + 398234.

It is an arithmetic number, because the mean of its divisors is an integer number (797905038).

Almost surely, 2^21017524992 is an apocalyptic number.

It is an amenable number.

21017524992 is an abundant number, since it is smaller than the sum of its proper divisors (36431637744).

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

21017524992 is an equidigital number, since it uses as much as digits as its factorization.

21017524992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739693 (or 739679 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21017524992 in words is "twenty-one billion, seventeen million, five hundred twenty-four thousand, nine hundred ninety-two".