21791867166976 has 81 divisors (see below), whose sum is σ = 43834684455471. Its totient is φ = 10812391905792.

The previous prime is 21791867166869. The next prime is 21791867167003. The reversal of 21791867166976 is 67966176819712.

The square root of 21791867166976 is 4668176.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10382022375 + ... + 10382024473.

Almost surely, 2^{21791867166976} is an apocalyptic number.

21791867166976 is the 4668176-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21791867166976

21791867166976 is an abundant number, since it is smaller than the sum of its proper divisors (22042817288495).

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

21791867166976 is an frugal number, since it uses more digits than its factorization.

21791867166976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492 (or 2240 counting only the distinct ones).

The product of its digits is 576108288, while the sum is 76.

The spelling of 21791867166976 in words is "twenty-one trillion, seven hundred ninety-one billion, eight hundred sixty-seven million, one hundred sixty-six thousand, nine hundred seventy-six".