21232553984 has 26 divisors (see below), whose sum is σ = 42459932430. Its totient is φ = 10616274944.

The previous prime is 21232553977. The next prime is 21232553987. The reversal of 21232553984 is 48935523212.

It can be written as a sum of positive squares in only one way, i.e., 20772880384 + 459673600 = 144128^2 + 21440^2 .

It is not an unprimeable number, because it can be changed into a prime (21232553987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2587769 + ... + 2595960.

Almost surely, 2^21232553984 is an apocalyptic number.

It is an amenable number.

21232553984 is a deficient number, since it is larger than the sum of its proper divisors (21227378446).

21232553984 is an frugal number, since it uses more digits than its factorization.

21232553984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5183753 (or 5183731 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The spelling of 21232553984 in words is "twenty-one billion, two hundred thirty-two million, five hundred fifty-three thousand, nine hundred eighty-four".