21200204025 has 576 divisors, whose sum is σ = 55571443200. Its totient is φ = 7586611200.

The previous prime is 21200203949. The next prime is 21200204063. The reversal of 21200204025 is 52040200212.

It is not a de Polignac number, because 21200204025 - 2⁸ = 21200203769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200203989 and 21200204007.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 187612369 + ... + 187612481.

It is an arithmetic number, because the mean of its divisors is an integer number (96478200).

Almost surely, 2^21200204025 is an apocalyptic number.

21200204025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21200204025 is an abundant number, since it is smaller than the sum of its proper divisors (34371239175).

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

21200204025 is a wasteful number, since it uses less digits than its factorization.

21200204025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 21200204025 its reverse (52040200212), we get a palindrome (73240404237).

The spelling of 21200204025 in words is "twenty-one billion, two hundred million, two hundred four thousand, twenty-five".