21631222752 has 96 divisors (see below), whose sum is σ = 60032649600. Its totient is φ = 6800951808.

The previous prime is 21631222729. The next prime is 21631222793. The reversal of 21631222752 is 25722213612.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391803 + ... + 443589.

It is an arithmetic number, because the mean of its divisors is an integer number (625340100).

Almost surely, 2^21631222752 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21631222752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30016324800).

21631222752 is an abundant number, since it is smaller than the sum of its proper divisors (38401426848).

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

21631222752 is a wasteful number, since it uses less digits than its factorization.

21631222752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52048 (or 52040 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The spelling of 21631222752 in words is "twenty-one billion, six hundred thirty-one million, two hundred twenty-two thousand, seven hundred fifty-two".