21621276233055 has 48 divisors (see below), whose sum is σ = 39726649070784. Its totient is φ = 10840657259520.

The previous prime is 21621276233027. The next prime is 21621276233099. The reversal of 21621276233055 is 55033267212612.

21621276233055 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 12 + 7 + 623 + 3 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 21621276233055 - 2⁶ = 21621276232991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21621276233055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15442611 + ... + 16784420.

It is an arithmetic number, because the mean of its divisors is an integer number (827638522308).

Almost surely, 2^{21621276233055} is an apocalyptic number.

21621276233055 is a deficient number, since it is larger than the sum of its proper divisors (18105372837729).

21621276233055 is a wasteful number, since it uses less digits than its factorization.

21621276233055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32227936 (or 32227933 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 21621276233055 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-six million, two hundred thirty-three thousand, fifty-five".