21764854591872 has 64 divisors (see below), whose sum is σ = 66071880019200. Its totient is φ = 6218529882624.

The previous prime is 21764854591759. The next prime is 21764854591937. The reversal of 21764854591872 is 27819545846712.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21764854591797 and 21764854591806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4048519372 + ... + 4048524747.

It is an arithmetic number, because the mean of its divisors is an integer number (1032373125300).

Almost surely, 2^{21764854591872} is an apocalyptic number.

It is an amenable number.

21764854591872 is an abundant number, since it is smaller than the sum of its proper divisors (44307025427328).

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

21764854591872 is an equidigital number, since it uses as much as digits as its factorization.

21764854591872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8097044143 (or 8097044131 counting only the distinct ones).

The product of its digits is 270950400, while the sum is 69.

The spelling of 21764854591872 in words is "twenty-one trillion, seven hundred sixty-four billion, eight hundred fifty-four million, five hundred ninety-one thousand, eight hundred seventy-two".