111231220131 has 12 divisors (see below), whose sum is σ = 160672512000. Its totient is φ = 74151749520.

The previous prime is 111231220127. The next prime is 111231220159. The reversal of 111231220131 is 131022132111.

It is not a de Polignac number, because 111231220131 - 2² = 111231220127 is a prime.

It is a super-2 number, since 2×111231220131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111231220181) 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, 121245 + ... + 486993.

It is an arithmetic number, because the mean of its divisors is an integer number (13389376000).

Almost surely, 2^111231220131 is an apocalyptic number.

111231220131 is a deficient number, since it is larger than the sum of its proper divisors (49441291869).

111231220131 is a wasteful number, since it uses less digits than its factorization.

111231220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399546 (or 399543 counting only the distinct ones).

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

Adding to 111231220131 its reverse (131022132111), we get a palindrome (242253352242).

The spelling of 111231220131 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred twenty thousand, one hundred thirty-one".