13121560125 has 24 divisors (see below), whose sum is σ = 23653801080. Its totient is φ = 6998164800.

The previous prime is 13121560103. The next prime is 13121560159. The reversal of 13121560125 is 52106512131.

13121560125 is a `hidden beast` number, since 1 + 31 + 2 + 1 + 5 + 601 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 219099204 + 12902460921 = 14802^2 + 113589^2 .

It is not a de Polignac number, because 13121560125 - 2⁹ = 13121559613 is a prime.

It is a super-2 number, since 2×13121560125² (a number of 21 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 5830680 + ... + 5832929.

It is an arithmetic number, because the mean of its divisors is an integer number (985575045).

Almost surely, 2^13121560125 is an apocalyptic number.

13121560125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13121560125 is a deficient number, since it is larger than the sum of its proper divisors (10532240955).

13121560125 is a wasteful number, since it uses less digits than its factorization.

13121560125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11663630 (or 11663617 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 13121560125 in words is "thirteen billion, one hundred twenty-one million, five hundred sixty thousand, one hundred twenty-five".