21723502504 has 32 divisors (see below), whose sum is σ = 45060287040. Its totient is φ = 9735241600.

The previous prime is 21723502499. The next prime is 21723502561. The reversal of 21723502504 is 40520532712.

It is a super-3 number, since 3×21723502504³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1732189 + ... + 1744684.

It is an arithmetic number, because the mean of its divisors is an integer number (1408133970).

Almost surely, 2^21723502504 is an apocalyptic number.

It is an amenable number.

21723502504 is an abundant number, since it is smaller than the sum of its proper divisors (23336784536).

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

21723502504 is a wasteful number, since it uses less digits than its factorization.

21723502504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476961 (or 3476957 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 21723502504 in words is "twenty-one billion, seven hundred twenty-three million, five hundred two thousand, five hundred four".