21404092400 has 60 divisors (see below), whose sum is σ = 52393635432. Its totient is φ = 8400088320.

The previous prime is 21404092397. The next prime is 21404092427. The reversal of 21404092400 is 429040412.

It is a self number, because there is not a number n which added to its sum of digits gives 21404092400.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 483614 + ... + 526013.

Almost surely, 2^21404092400 is an apocalyptic number.

21404092400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404092400 is an abundant number, since it is smaller than the sum of its proper divisors (30989543032).

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

21404092400 is a wasteful number, since it uses less digits than its factorization.

21404092400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009698 (or 1009687 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21404092400 in words is "twenty-one billion, four hundred four million, ninety-two thousand, four hundred".