21404322057456 has 60 divisors (see below), whose sum is σ = 64510248428808. Its totient is φ = 6585945247872.

The previous prime is 21404322057449. The next prime is 21404322057511. The reversal of 21404322057456 is 65475022340412.

21404322057456 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 4 + 3 + 2 + 20 + 574 + 56 = 666.

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, 5716964490 + ... + 5716968233.

Almost surely, 2^{21404322057456} is an apocalyptic number.

21404322057456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21404322057456 is an abundant number, since it is smaller than the sum of its proper divisors (43105926371352).

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

21404322057456 is a wasteful number, since it uses less digits than its factorization.

21404322057456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11433932750 (or 11433932741 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 45.

Adding to 21404322057456 its reverse (65475022340412), we get a palindrome (86879344397868).

The spelling of 21404322057456 in words is "twenty-one trillion, four hundred four billion, three hundred twenty-two million, fifty-seven thousand, four hundred fifty-six".