21200134125 has 64 divisors (see below), whose sum is σ = 36241920000. Its totient is φ = 10999598400.

The previous prime is 21200134117. The next prime is 21200134139. The reversal of 21200134125 is 52143100212.

It is not a de Polignac number, because 21200134125 - 2³ = 21200134117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4238376 + ... + 4243374.

It is an arithmetic number, because the mean of its divisors is an integer number (566280000).

Almost surely, 2^21200134125 is an apocalyptic number.

21200134125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21200134125 is a deficient number, since it is larger than the sum of its proper divisors (15041785875).

21200134125 is a wasteful number, since it uses less digits than its factorization.

21200134125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323 (or 5313 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21200134125 its reverse (52143100212), we get a palindrome (73343234337).

The spelling of 21200134125 in words is "twenty-one billion, two hundred million, one hundred thirty-four thousand, one hundred twenty-five".