21570518670 has 16 divisors (see below), whose sum is σ = 51769244880. Its totient is φ = 5752138304.

The previous prime is 21570518621. The next prime is 21570518687. The reversal of 21570518670 is 7681507512.

It is a congruent number.

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, 359508615 + ... + 359508674.

It is an arithmetic number, because the mean of its divisors is an integer number (3235577805).

Almost surely, 2^21570518670 is an apocalyptic number.

21570518670 is an abundant number, since it is smaller than the sum of its proper divisors (30198726210).

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

21570518670 is a wasteful number, since it uses less digits than its factorization.

21570518670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719017299.

The product of its (nonzero) digits is 117600, while the sum is 42.

The spelling of 21570518670 in words is "twenty-one billion, five hundred seventy million, five hundred eighteen thousand, six hundred seventy".