111213221231 has 16 divisors (see below), whose sum is σ = 130511727360. Its totient is φ = 92778544320.

The previous prime is 111213221191. The next prime is 111213221233. The reversal of 111213221231 is 132122312111.

It is not a de Polignac number, because 111213221231 - 2⁶ = 111213221167 is a prime.

It is a super-2 number, since 2×111213221231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111213221233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342161 + ... + 582666.

It is an arithmetic number, because the mean of its divisors is an integer number (8156982960).

Almost surely, 2^111213221231 is an apocalyptic number.

111213221231 is a deficient number, since it is larger than the sum of its proper divisors (19298506129).

111213221231 is an equidigital number, since it uses as much as digits as its factorization.

111213221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925294.

The product of its digits is 144, while the sum is 20.

Adding to 111213221231 its reverse (132122312111), we get a palindrome (243335533342).

The spelling of 111213221231 in words is "one hundred eleven billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred thirty-one".