13121612131 has 4 divisors (see below), whose sum is σ = 13129485192. Its totient is φ = 13113739072.

The previous prime is 13121612117. The next prime is 13121612149.

It is a happy number.

13121612131 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13121612131 - 2⁵ = 13121612099 is a prime.

It is a super-2 number, since 2×13121612131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121612431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3934030 + ... + 3937363.

It is an arithmetic number, because the mean of its divisors is an integer number (3282371298).

Almost surely, 2^13121612131 is an apocalyptic number.

13121612131 is a deficient number, since it is larger than the sum of its proper divisors (7873061).

13121612131 is an equidigital number, since it uses as much as digits as its factorization.

13121612131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7873060.

The product of its digits is 216, while the sum is 22.

The spelling of 13121612131 in words is "thirteen billion, one hundred twenty-one million, six hundred twelve thousand, one hundred thirty-one".