21255424204200 has 48 divisors (see below), whose sum is σ = 65891815034880. Its totient is φ = 5668113120960.

The previous prime is 21255424204193. The next prime is 21255424204211. The reversal of 21255424204200 is 240242455212.

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, 17712852904 + ... + 17712854103.

It is an arithmetic number, because the mean of its divisors is an integer number (1372746146560).

Almost surely, 2^{21255424204200} is an apocalyptic number.

21255424204200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21255424204200 is an abundant number, since it is smaller than the sum of its proper divisors (44636390830680).

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

21255424204200 is a wasteful number, since it uses less digits than its factorization.

21255424204200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35425707026 (or 35425707017 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 33.

Adding to 21255424204200 its reverse (240242455212), we get a palindrome (21495666659412).

The spelling of 21255424204200 in words is "twenty-one trillion, two hundred fifty-five billion, four hundred twenty-four million, two hundred four thousand, two hundred".