21672862794 has 64 divisors (see below), whose sum is σ = 55630903680. Its totient is φ = 6181205760.

The previous prime is 21672862793. The next prime is 21672862889. The reversal of 21672862794 is 49726827612.

21672862794 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 2 + 8 + 627 + 9 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 21672862794.

It is not an unprimeable number, because it can be changed into a prime (21672862793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1063029 + ... + 1083224.

It is an arithmetic number, because the mean of its divisors is an integer number (869232870).

Almost surely, 2^21672862794 is an apocalyptic number.

21672862794 is an abundant number, since it is smaller than the sum of its proper divisors (33958040886).

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

21672862794 is a wasteful number, since it uses less digits than its factorization.

21672862794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146292 (or 2146286 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The spelling of 21672862794 in words is "twenty-one billion, six hundred seventy-two million, eight hundred sixty-two thousand, seven hundred ninety-four".