21642432664674 has 32 divisors (see below), whose sum is σ = 44212753911744. Its totient is φ = 7061004887040.

The previous prime is 21642432664651. The next prime is 21642432664687. The reversal of 21642432664674 is 47646623424612.

It is a super-2 number, since 2×21642432664674² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 188537839 + ... + 188652594.

It is an arithmetic number, because the mean of its divisors is an integer number (1381648559742).

Almost surely, 2^{21642432664674} is an apocalyptic number.

21642432664674 is an abundant number, since it is smaller than the sum of its proper divisors (22570321247070).

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

21642432664674 is a wasteful number, since it uses less digits than its factorization.

21642432664674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377190642.

The product of its digits is 55738368, while the sum is 57.

The spelling of 21642432664674 in words is "twenty-one trillion, six hundred forty-two billion, four hundred thirty-two million, six hundred sixty-four thousand, six hundred seventy-four".