21252489384 has 64 divisors (see below), whose sum is σ = 60795043200. Its totient is φ = 6064775424.

The previous prime is 21252489367. The next prime is 21252489397. The reversal of 21252489384 is 48398425212.

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 15 ways as a sum of consecutive naturals, for example, 62974 + ... + 215570.

It is an arithmetic number, because the mean of its divisors is an integer number (949922550).

Almost surely, 2^21252489384 is an apocalyptic number.

21252489384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21252489384 is an abundant number, since it is smaller than the sum of its proper divisors (39542553816).

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

21252489384 is a wasteful number, since it uses less digits than its factorization.

21252489384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153442 (or 153438 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The spelling of 21252489384 in words is "twenty-one billion, two hundred fifty-two million, four hundred eighty-nine thousand, three hundred eighty-four".