21672605234 has 32 divisors (see below), whose sum is σ = 37933488000. Its totient is φ = 9282814800.

The previous prime is 21672605233. The next prime is 21672605243. The reversal of 21672605234 is 43250627612.

It is not an unprimeable number, because it can be changed into a prime (21672605233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295777 + ... + 1312395.

It is an arithmetic number, because the mean of its divisors is an integer number (1185421500).

Almost surely, 2^21672605234 is an apocalyptic number.

21672605234 is a deficient number, since it is larger than the sum of its proper divisors (16260882766).

21672605234 is a wasteful number, since it uses less digits than its factorization.

21672605234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18543 (or 18529 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 21672605234 in words is "twenty-one billion, six hundred seventy-two million, six hundred five thousand, two hundred thirty-four".