21622673772555 has 16 divisors (see below), whose sum is σ = 35182655631360. Its totient is φ = 11336633480288.

The previous prime is 21622673772451. The next prime is 21622673772589. The reversal of 21622673772555 is 55527737622612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21622673772555 - 2²⁰ = 21622672723979 is a prime.

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, 12216198987 + ... + 12216200756.

It is an arithmetic number, because the mean of its divisors is an integer number (2198915976960).

Almost surely, 2^{21622673772555} is an apocalyptic number.

21622673772555 is a deficient number, since it is larger than the sum of its proper divisors (13559981858805).

21622673772555 is a wasteful number, since it uses less digits than its factorization.

21622673772555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24432399810.

The product of its digits is 74088000, while the sum is 60.

The spelling of 21622673772555 in words is "twenty-one trillion, six hundred twenty-two billion, six hundred seventy-three million, seven hundred seventy-two thousand, five hundred fifty-five".