21320532372 has 24 divisors (see below), whose sum is σ = 50347283616. Its totient is φ = 7021219168.

The previous prime is 21320532361. The next prime is 21320532383. The reversal of 21320532372 is 27323502312.

It is an interprime number because it is at equal distance from previous prime (21320532361) and next prime (21320532383).

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 7 ways as a sum of consecutive naturals, for example, 10702083 + ... + 10704074.

It is an arithmetic number, because the mean of its divisors is an integer number (2097803484).

Almost surely, 2^21320532372 is an apocalyptic number.

It is an amenable number.

21320532372 is an abundant number, since it is smaller than the sum of its proper divisors (29026751244).

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

21320532372 is a wasteful number, since it uses less digits than its factorization.

21320532372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21406247 (or 21406245 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 30.

The spelling of 21320532372 in words is "twenty-one billion, three hundred twenty million, five hundred thirty-two thousand, three hundred seventy-two".