21083178272 has 48 divisors (see below), whose sum is σ = 44720165952. Its totient is φ = 9726393600.

The previous prime is 21083178209. The next prime is 21083178293. The reversal of 21083178272 is 27287138012.

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, 1051283 + ... + 1071149.

It is an arithmetic number, because the mean of its divisors is an integer number (931670124).

Almost surely, 2^21083178272 is an apocalyptic number.

It is an amenable number.

21083178272 is an abundant number, since it is smaller than the sum of its proper divisors (23636987680).

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

21083178272 is a wasteful number, since it uses less digits than its factorization.

21083178272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22441 (or 22433 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 21083178272 in words is "twenty-one billion, eighty-three million, one hundred seventy-eight thousand, two hundred seventy-two".