21611723323504 has 20 divisors (see below), whose sum is σ = 41875254191664. Its totient is φ = 10805206112768.

The previous prime is 21611723323499. The next prime is 21611723323543. The reversal of 21611723323504 is 40532332711612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40699777 + ... + 41227360.

Almost surely, 2^{21611723323504} is an apocalyptic number.

It is an amenable number.

21611723323504 is a deficient number, since it is larger than the sum of its proper divisors (20263530868160).

21611723323504 is a wasteful number, since it uses less digits than its factorization.

21611723323504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81943632 (or 81943626 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 21611723323504 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-three million, three hundred twenty-three thousand, five hundred four".