21175426925 has 6 divisors (see below), whose sum is σ = 26257529418. Its totient is φ = 16940341520.

The previous prime is 21175426861. The next prime is 21175426931. The reversal of 21175426925 is 52962457112.

It can be written as a sum of positive squares in 3 ways, for example, as 401681764 + 20773745161 = 20042^2 + 144131^2 .

It is not a de Polignac number, because 21175426925 - 2⁶ = 21175426861 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 423508514 + ... + 423508563.

It is an arithmetic number, because the mean of its divisors is an integer number (4376254903).

Almost surely, 2^21175426925 is an apocalyptic number.

21175426925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21175426925 is a deficient number, since it is larger than the sum of its proper divisors (5082102493).

21175426925 is an equidigital number, since it uses as much as digits as its factorization.

21175426925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847017087 (or 847017082 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The spelling of 21175426925 in words is "twenty-one billion, one hundred seventy-five million, four hundred twenty-six thousand, nine hundred twenty-five".