21425551125200 has 30 divisors (see below), whose sum is σ = 51474886579254. Its totient is φ = 8570220449920.

The previous prime is 21425551125179. The next prime is 21425551125239. The reversal of 21425551125200 is 252115552412.

It can be written as a sum of positive squares in 3 ways, for example, as 117024199744 + 21308526925456 = 342088^2 + 4616116^2 .

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, 26781938507 + ... + 26781939306.

Almost surely, 2^{21425551125200} is an apocalyptic number.

21425551125200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21425551125200 is an abundant number, since it is smaller than the sum of its proper divisors (30049335454054).

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

21425551125200 is a wasteful number, since it uses less digits than its factorization.

21425551125200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53563877831 (or 53563877820 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 35.

Adding to 21425551125200 its reverse (252115552412), we get a palindrome (21677666677612).

The spelling of 21425551125200 in words is "twenty-one trillion, four hundred twenty-five billion, five hundred fifty-one million, one hundred twenty-five thousand, two hundred".