21867166624 has 24 divisors (see below), whose sum is σ = 43197934500. Its totient is φ = 10896262656.

The previous prime is 21867166577. The next prime is 21867166627. The reversal of 21867166624 is 42666176812.

It can be written as a sum of positive squares in 2 ways, for example, as 19507150224 + 2360016400 = 139668^2 + 48580^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21867166627) 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 3 ways as a sum of consecutive naturals, for example, 1156749 + ... + 1175500.

Almost surely, 2^21867166624 is an apocalyptic number.

It is an amenable number.

21867166624 is a deficient number, since it is larger than the sum of its proper divisors (21330767876).

21867166624 is a wasteful number, since it uses less digits than its factorization.

21867166624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332552 (or 2332544 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The spelling of 21867166624 in words is "twenty-one billion, eight hundred sixty-seven million, one hundred sixty-six thousand, six hundred twenty-four".