21829944923172 has 48 divisors (see below), whose sum is σ = 56614476206400. Its totient is φ = 7274292531840.

The previous prime is 21829944923153. The next prime is 21829944923263. The reversal of 21829944923172 is 27132944992812.

21829944923172 is a `hidden beast` number, since 2 + 1 + 8 + 2 + 99 + 449 + 2 + 31 + 72 = 666.

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, 32383954 + ... + 33051177.

It is an arithmetic number, because the mean of its divisors is an integer number (1179468254300).

Almost surely, 2^{21829944923172} is an apocalyptic number.

It is an amenable number.

21829944923172 is an abundant number, since it is smaller than the sum of its proper divisors (34784531283228).

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

21829944923172 is a wasteful number, since it uses less digits than its factorization.

21829944923172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65438233 (or 65438225 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 21829944923172 in words is "twenty-one trillion, eight hundred twenty-nine billion, nine hundred forty-four million, nine hundred twenty-three thousand, one hundred seventy-two".