21137346870 has 32 divisors (see below), whose sum is σ = 52478932320. Its totient is φ = 5442259200.

The previous prime is 21137346859. The next prime is 21137346913. The reversal of 21137346870 is 7864373112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12147031 + ... + 12148770.

It is an arithmetic number, because the mean of its divisors is an integer number (1639966635).

Almost surely, 2^21137346870 is an apocalyptic number.

21137346870 is an abundant number, since it is smaller than the sum of its proper divisors (31341585450).

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

21137346870 is a wasteful number, since it uses less digits than its factorization.

21137346870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24295840.

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 21137346870 in words is "twenty-one billion, one hundred thirty-seven million, three hundred forty-six thousand, eight hundred seventy".