21251922732 has 72 divisors (see below), whose sum is σ = 54258684480. Its totient is φ = 7013306880.

The previous prime is 21251922721. The next prime is 21251922737. The reversal of 21251922732 is 23722915212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21251922737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1493869 + ... + 1508027.

It is an arithmetic number, because the mean of its divisors is an integer number (753592840).

Almost surely, 2^21251922732 is an apocalyptic number.

It is an amenable number.

21251922732 is an abundant number, since it is smaller than the sum of its proper divisors (33006761748).

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

21251922732 is a wasteful number, since it uses less digits than its factorization.

21251922732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583 (or 14578 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 21251922732 in words is "twenty-one billion, two hundred fifty-one million, nine hundred twenty-two thousand, seven hundred thirty-two".