111221031231 has 24 divisors (see below), whose sum is σ = 171976989184. Its totient is φ = 71755499160.

The previous prime is 111221031209. The next prime is 111221031247. The reversal of 111221031231 is 132130122111.

111221031231 is a `hidden beast` number, since 1 + 112 + 210 + 312 + 31 = 666.

It is not a de Polignac number, because 111221031231 - 2⁶ = 111221031167 is a prime.

It is a super-2 number, since 2×111221031231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221031631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7374721 + ... + 7389786.

Almost surely, 2^111221031231 is an apocalyptic number.

111221031231 is a deficient number, since it is larger than the sum of its proper divisors (60755957953).

111221031231 is an equidigital number, since it uses as much as digits as its factorization.

111221031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14764553 (or 14764541 counting only the distinct ones).

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

Adding to 111221031231 its reverse (132130122111), we get a palindrome (243351153342).

The spelling of 111221031231 in words is "one hundred eleven billion, two hundred twenty-one million, thirty-one thousand, two hundred thirty-one".