21530501422504 has 32 divisors (see below), whose sum is σ = 40658435854920. Its totient is φ = 10688421655296.

The previous prime is 21530501422439. The next prime is 21530501422621. The reversal of 21530501422504 is 40522410503512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21354103102500 + 176398320004 = 4621050^2 + 419998^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21530501422504.

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, 9597207 + ... + 11626150.

Almost surely, 2^{21530501422504} is an apocalyptic number.

It is an amenable number.

21530501422504 is a deficient number, since it is larger than the sum of its proper divisors (19127934432416).

21530501422504 is a wasteful number, since it uses less digits than its factorization.

21530501422504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21224269 (or 21224265 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 21530501422504 in words is "twenty-one trillion, five hundred thirty billion, five hundred one million, four hundred twenty-two thousand, five hundred four".