21504452522 has 24 divisors (see below), whose sum is σ = 38438279460. Its totient is φ = 8991407040.

The previous prime is 21504452507. The next prime is 21504452569. The reversal of 21504452522 is 22525440512.

It can be written as a sum of positive squares in 2 ways, for example, as 16830132361 + 4674320161 = 129731^2 + 68369^2 .

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 11 ways as a sum of consecutive naturals, for example, 2671997 + ... + 2680032.

Almost surely, 2^21504452522 is an apocalyptic number.

21504452522 is a deficient number, since it is larger than the sum of its proper divisors (16933826938).

21504452522 is a wasteful number, since it uses less digits than its factorization.

21504452522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352086 (or 5352079 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

The spelling of 21504452522 in words is "twenty-one billion, five hundred four million, four hundred fifty-two thousand, five hundred twenty-two".