21237346572 has 24 divisors (see below), whose sum is σ = 53365640496. Its totient is φ = 6534568128.

The previous prime is 21237346567. The next prime is 21237346591. The reversal of 21237346572 is 27564373212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68068263 + ... + 68068574.

It is an arithmetic number, because the mean of its divisors is an integer number (2223568354).

Almost surely, 2^21237346572 is an apocalyptic number.

It is an amenable number.

21237346572 is an abundant number, since it is smaller than the sum of its proper divisors (32128293924).

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

21237346572 is a wasteful number, since it uses less digits than its factorization.

21237346572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136136857 (or 136136855 counting only the distinct ones).

The product of its digits is 423360, while the sum is 42.

The spelling of 21237346572 in words is "twenty-one billion, two hundred thirty-seven million, three hundred forty-six thousand, five hundred seventy-two".