21123663622623 has 16 divisors (see below), whose sum is σ = 31598144797440. Its totient is φ = 13945719671352.

The previous prime is 21123663622597. The next prime is 21123663622627. The reversal of 21123663622623 is 32622636632112.

It is a happy number.

21123663622623 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 3 + 6 + 636 + 2 + 2 + 6 + 2 + 3 = 666.

It is not a de Polignac number, because 21123663622623 - 2⁵ = 21123663622591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123663622627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3797851161 + ... + 3797856722.

It is an arithmetic number, because the mean of its divisors is an integer number (1974884049840).

Almost surely, 2^{21123663622623} is an apocalyptic number.

21123663622623 is a deficient number, since it is larger than the sum of its proper divisors (10474481174817).

21123663622623 is a wasteful number, since it uses less digits than its factorization.

21123663622623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7595707995 (or 7595707989 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 45.

The spelling of 21123663622623 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred sixty-three million, six hundred twenty-two thousand, six hundred twenty-three".