21641612422455 has 24 divisors (see below), whose sum is σ = 37512252301680. Its totient is φ = 11542155106560.

The previous prime is 21641612422373. The next prime is 21641612422477. The reversal of 21641612422455 is 55422421614612.

21641612422455 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 1 + 612 + 4 + 2 + 24 + 5 + 5 = 666.

It is not a de Polignac number, because 21641612422455 - 2³³ = 21633022487863 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 21641612422455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17665231 + ... + 18850559.

It is an arithmetic number, because the mean of its divisors is an integer number (1563010512570).

Almost surely, 2^{21641612422455} is an apocalyptic number.

21641612422455 is a deficient number, since it is larger than the sum of its proper divisors (15870639879225).

21641612422455 is a wasteful number, since it uses less digits than its factorization.

21641612422455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591071 (or 1591068 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The spelling of 21641612422455 in words is "twenty-one trillion, six hundred forty-one billion, six hundred twelve million, four hundred twenty-two thousand, four hundred fifty-five".