21423622861172 has 48 divisors (see below), whose sum is σ = 42900656400000. Its totient is φ = 9170113240704.

The previous prime is 21423622861139. The next prime is 21423622861217. The reversal of 21423622861172 is 27116822632412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91144454 + ... + 91379202.

It is an arithmetic number, because the mean of its divisors is an integer number (893763675000).

Almost surely, 2^{21423622861172} is an apocalyptic number.

It is an amenable number.

21423622861172 is an abundant number, since it is smaller than the sum of its proper divisors (21477033538828).

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

21423622861172 is a wasteful number, since it uses less digits than its factorization.

21423622861172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238808 (or 238806 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The spelling of 21423622861172 in words is "twenty-one trillion, four hundred twenty-three billion, six hundred twenty-two million, eight hundred sixty-one thousand, one hundred seventy-two".