21522421752 has 48 divisors (see below), whose sum is σ = 58263371640. Its totient is φ = 6622282368.

The previous prime is 21522421733. The next prime is 21522421763. The reversal of 21522421752 is 25712422512.

It is a congruent number.

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, 2649103 + ... + 2657214.

Almost surely, 2^21522421752 is an apocalyptic number.

It is an amenable number.

21522421752 is an abundant number, since it is smaller than the sum of its proper divisors (36740949888).

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

21522421752 is a wasteful number, since it uses less digits than its factorization.

21522421752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306352 (or 5306335 counting only the distinct ones).

The product of its digits is 22400, while the sum is 33.

The spelling of 21522421752 in words is "twenty-one billion, five hundred twenty-two million, four hundred twenty-one thousand, seven hundred fifty-two".