21670962180 has 48 divisors (see below), whose sum is σ = 69347080320. Its totient is φ = 4953362688.

The previous prime is 21670962169. The next prime is 21670962193. The reversal of 21670962180 is 8126907612.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 25798345 + ... + 25799184.

It is an arithmetic number, because the mean of its divisors is an integer number (1444730840).

Almost surely, 2^21670962180 is an apocalyptic number.

21670962180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21670962180 is an abundant number, since it is smaller than the sum of its proper divisors (47676118140).

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

21670962180 is a wasteful number, since it uses less digits than its factorization.

21670962180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51597548 (or 51597546 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 21670962180 in words is "twenty-one billion, six hundred seventy million, nine hundred sixty-two thousand, one hundred eighty".