21365041704400 has 30 divisors (see below), whose sum is σ = 51329512695782. Its totient is φ = 8546016681600.

The previous prime is 21365041704379. The next prime is 21365041704443. The reversal of 21365041704400 is 440714056312.

It can be written as a sum of positive squares in 3 ways, for example, as 339478691904 + 21025563012496 = 582648^2 + 4585364^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21365041704400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26706301731 + ... + 26706302530.

Almost surely, 2^{21365041704400} is an apocalyptic number.

21365041704400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21365041704400 is an abundant number, since it is smaller than the sum of its proper divisors (29964470991382).

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

21365041704400 is a wasteful number, since it uses less digits than its factorization.

21365041704400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53412604279 (or 53412604268 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 21365041704400 in words is "twenty-one trillion, three hundred sixty-five billion, forty-one million, seven hundred four thousand, four hundred".