21623523662516 has 24 divisors (see below), whose sum is σ = 42175913028480. Its totient is φ = 9640208691072.

The previous prime is 21623523662509. The next prime is 21623523662557. The reversal of 21623523662516 is 61526632532612.

It is a happy number.

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, 8368235420 + ... + 8368238003.

It is an arithmetic number, because the mean of its divisors is an integer number (1757329709520).

Almost surely, 2^{21623523662516} is an apocalyptic number.

It is an amenable number.

21623523662516 is a deficient number, since it is larger than the sum of its proper divisors (20552389365964).

21623523662516 is a wasteful number, since it uses less digits than its factorization.

21623523662516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16736473463 (or 16736473461 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 50.

The spelling of 21623523662516 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-three million, six hundred sixty-two thousand, five hundred sixteen".