13121209425 has 12 divisors (see below), whose sum is σ = 21693733040. Its totient is φ = 6997978320.

The previous prime is 13121209369. The next prime is 13121209429. The reversal of 13121209425 is 52490212131.

It is not a de Polignac number, because 13121209425 - 2¹¹ = 13121207377 is a prime.

It is a super-2 number, since 2×13121209425² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13121209392 and 13121209401.

It is not an unprimeable number, because it can be changed into a prime (13121209429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87474655 + ... + 87474804.

Almost surely, 2^13121209425 is an apocalyptic number.

13121209425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13121209425 is a deficient number, since it is larger than the sum of its proper divisors (8572523615).

13121209425 is a wasteful number, since it uses less digits than its factorization.

13121209425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174949472 (or 174949467 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 13121209425 in words is "thirteen billion, one hundred twenty-one million, two hundred nine thousand, four hundred twenty-five".