21817631676 has 48 divisors (see below), whose sum is σ = 53627132160. Its totient is φ = 6884640000.

The previous prime is 21817631623. The next prime is 21817631707. The reversal of 21817631676 is 67613671812.

It is a congruent 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, 276676 + ... + 346676.

It is an arithmetic number, because the mean of its divisors is an integer number (1117231920).

Almost surely, 2^21817631676 is an apocalyptic number.

It is an amenable number.

21817631676 is an abundant number, since it is smaller than the sum of its proper divisors (31809500484).

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

21817631676 is a wasteful number, since it uses less digits than its factorization.

21817631676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71394 (or 71392 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The spelling of 21817631676 in words is "twenty-one billion, eight hundred seventeen million, six hundred thirty-one thousand, six hundred seventy-six".