21293773180 has 12 divisors (see below), whose sum is σ = 44716923720. Its totient is φ = 8517509264.

The previous prime is 21293773169. The next prime is 21293773187. The reversal of 21293773180 is 8137739212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21293773187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532344310 + ... + 532344349.

It is an arithmetic number, because the mean of its divisors is an integer number (3726410310).

Almost surely, 2^21293773180 is an apocalyptic number.

21293773180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21293773180 is an abundant number, since it is smaller than the sum of its proper divisors (23423150540).

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

21293773180 is a wasteful number, since it uses less digits than its factorization.

21293773180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064688668 (or 1064688666 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 21293773180 in words is "twenty-one billion, two hundred ninety-three million, seven hundred seventy-three thousand, one hundred eighty".