21572342600 has 48 divisors (see below), whose sum is σ = 50615891700. Its totient is φ = 8549763840.

The previous prime is 21572342591. The next prime is 21572342657. The reversal of 21572342600 is 624327512.

It can be written as a sum of positive squares in 6 ways, for example, as 17102885284 + 4469457316 = 130778^2 + 66854^2 .

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, 472979 + ... + 516578.

Almost surely, 2^21572342600 is an apocalyptic number.

21572342600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21572342600 is an abundant number, since it is smaller than the sum of its proper divisors (29043549100).

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

21572342600 is a wasteful number, since it uses less digits than its factorization.

21572342600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989682 (or 989673 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21572342600 in words is "twenty-one billion, five hundred seventy-two million, three hundred forty-two thousand, six hundred".