21112501125 has 16 divisors (see below), whose sum is σ = 35131202496. Its totient is φ = 11260000400.

The previous prime is 21112501103. The next prime is 21112501129. The reversal of 21112501125 is 52110521112.

It is not a de Polignac number, because 21112501125 - 2¹⁵ = 21112468357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112501129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28149627 + ... + 28150376.

It is an arithmetic number, because the mean of its divisors is an integer number (2195700156).

Almost surely, 2^21112501125 is an apocalyptic number.

21112501125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21112501125 is a deficient number, since it is larger than the sum of its proper divisors (14018701371).

21112501125 is an equidigital number, since it uses as much as digits as its factorization.

21112501125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56300021 (or 56300011 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 21.

The spelling of 21112501125 in words is "twenty-one billion, one hundred twelve million, five hundred one thousand, one hundred twenty-five".