21517147772004 has 72 divisors (see below), whose sum is σ = 52185906085824. Its totient is φ = 6898890387200.

The previous prime is 21517147771993. The next prime is 21517147772051. The reversal of 21517147772004 is 40027774171512.

It is a super-3 number, since 3×21517147772004³ (a number of 41 digits) contains 333 as substring.

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, 6079647 + ... + 8944070.

It is an arithmetic number, because the mean of its divisors is an integer number (724804251192).

Almost surely, 2^{21517147772004} is an apocalyptic number.

It is an amenable number.

21517147772004 is an abundant number, since it is smaller than the sum of its proper divisors (30668758313820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21517147772004 is a wasteful number, since it uses less digits than its factorization.

21517147772004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15023877 (or 15023834 counting only the distinct ones).

The product of its (nonzero) digits is 768320, while the sum is 48.

The spelling of 21517147772004 in words is "twenty-one trillion, five hundred seventeen billion, one hundred forty-seven million, seven hundred seventy-two thousand, four".