21648525188402 has 12 divisors (see below), whose sum is σ = 37774467420750. Its totient is φ = 9277939366416.

The previous prime is 21648525188399. The next prime is 21648525188471. The reversal of 21648525188402 is 20488152584612.

It can be written as a sum of positive squares in only one way, i.e., 14136765292321 + 7511759896081 = 3759889^2 + 2740759^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110451659027 + ... + 110451659222.

Almost surely, 2^{21648525188402} is an apocalyptic number.

21648525188402 is a deficient number, since it is larger than the sum of its proper divisors (16125942232348).

21648525188402 is a wasteful number, since it uses less digits than its factorization.

21648525188402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220903318265 (or 220903318258 counting only the distinct ones).

The product of its (nonzero) digits is 9830400, while the sum is 56.

The spelling of 21648525188402 in words is "twenty-one trillion, six hundred forty-eight billion, five hundred twenty-five million, one hundred eighty-eight thousand, four hundred two".