21320382552 has 48 divisors (see below), whose sum is σ = 62003156760. Its totient is φ = 6091537536.

The previous prime is 21320382547. The next prime is 21320382583. The reversal of 21320382552 is 25528302312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9063613 + ... + 9065964.

Almost surely, 2^21320382552 is an apocalyptic number.

It is an amenable number.

21320382552 is an abundant number, since it is smaller than the sum of its proper divisors (40682774208).

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

21320382552 is a wasteful number, since it uses less digits than its factorization.

21320382552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18129600 (or 18129589 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21320382552 its reverse (25528302312), we get a palindrome (46848684864).

The spelling of 21320382552 in words is "twenty-one billion, three hundred twenty million, three hundred eighty-two thousand, five hundred fifty-two".