21055474572 has 48 divisors (see below), whose sum is σ = 53604415872. Its totient is φ = 6379415680.

The previous prime is 21055474537. The next prime is 21055474577. The reversal of 21055474572 is 27547455012.

It is not an unprimeable number, because it can be changed into a prime (21055474577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1353583 + ... + 1369049.

It is an arithmetic number, because the mean of its divisors is an integer number (1116758664).

Almost surely, 2^21055474572 is an apocalyptic number.

21055474572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21055474572 is an abundant number, since it is smaller than the sum of its proper divisors (32548941300).

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

21055474572 is a wasteful number, since it uses less digits than its factorization.

21055474572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25798 (or 25796 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 42.

The spelling of 21055474572 in words is "twenty-one billion, fifty-five million, four hundred seventy-four thousand, five hundred seventy-two".