21606642431124 has 48 divisors (see below), whose sum is σ = 52158095035200. Its totient is φ = 6953311192576.

The previous prime is 21606642431123. The next prime is 21606642431137. The reversal of 21606642431124 is 42113424660612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606642431123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1953004 + ... + 6857660.

It is an arithmetic number, because the mean of its divisors is an integer number (1086626979900).

Almost surely, 2^{21606642431124} is an apocalyptic number.

It is an amenable number.

21606642431124 is an abundant number, since it is smaller than the sum of its proper divisors (30551452604076).

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

21606642431124 is a wasteful number, since it uses less digits than its factorization.

21606642431124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917352 (or 4917350 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The spelling of 21606642431124 in words is "twenty-one trillion, six hundred six billion, six hundred forty-two million, four hundred thirty-one thousand, one hundred twenty-four".