12121131231 has 12 divisors (see below), whose sum is σ = 19099964520. Its totient is φ = 7346140080.

The previous prime is 12121131199. The next prime is 12121131241. The reversal of 12121131231 is 13213112121.

It is not a de Polignac number, because 12121131231 - 2⁵ = 12121131199 is a prime.

It is a super-2 number, since 2×12121131231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121131241) 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, 61217736 + ... + 61217933.

It is an arithmetic number, because the mean of its divisors is an integer number (1591663710).

Almost surely, 2^12121131231 is an apocalyptic number.

12121131231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121131231 is a deficient number, since it is larger than the sum of its proper divisors (6978833289).

12121131231 is a wasteful number, since it uses less digits than its factorization.

12121131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122435686 (or 122435683 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 12121131231 its reverse (13213112121), we get a palindrome (25334243352).

The spelling of 12121131231 in words is "twelve billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-one".