12121113131 has 4 divisors (see below), whose sum is σ = 12136322352. Its totient is φ = 12105903912.

The previous prime is 12121113079. The next prime is 12121113133. The reversal of 12121113131 is 13131112121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121113131 is a prime.

It is a super-2 number, since 2×12121113131² (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 (12121113133) 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, 7603415 + ... + 7605008.

It is an arithmetic number, because the mean of its divisors is an integer number (3034080588).

Almost surely, 2^12121113131 is an apocalyptic number.

12121113131 is a deficient number, since it is larger than the sum of its proper divisors (15209221).

12121113131 is an equidigital number, since it uses as much as digits as its factorization.

12121113131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15209220.

The product of its digits is 36, while the sum is 17.

Adding to 12121113131 its reverse (13131112121), we get a palindrome (25252225252).

The spelling of 12121113131 in words is "twelve billion, one hundred twenty-one million, one hundred thirteen thousand, one hundred thirty-one".