21172580770 has 64 divisors (see below), whose sum is σ = 43475927040. Its totient is φ = 7348580800.

The previous prime is 21172580711. The next prime is 21172580771. The reversal of 21172580770 is 7708527112.

It is not an unprimeable number, because it can be changed into a prime (21172580771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1203135 + ... + 1220605.

It is an arithmetic number, because the mean of its divisors is an integer number (679311360).

Almost surely, 2^21172580770 is an apocalyptic number.

21172580770 is an abundant number, since it is smaller than the sum of its proper divisors (22303346270).

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

21172580770 is a wasteful number, since it uses less digits than its factorization.

21172580770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17991.

The product of its (nonzero) digits is 54880, while the sum is 40.

The spelling of 21172580770 in words is "twenty-one billion, one hundred seventy-two million, five hundred eighty thousand, seven hundred seventy".