111231211220231 has 24 divisors (see below), whose sum is σ = 117563885072928. Its totient is φ = 105224163264000.

The previous prime is 111231211220191. The next prime is 111231211220249. The reversal of 111231211220231 is 132022112132111.

It is not a de Polignac number, because 111231211220231 - 2⁴⁶ = 40862467042567 is a prime.

It is a super-2 number, since 2×111231211220231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111231211220197 and 111231211220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111231211220251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1040258651 + ... + 1040365571.

It is an arithmetic number, because the mean of its divisors is an integer number (4898495211372).

Almost surely, 2^{111231211220231} is an apocalyptic number.

111231211220231 is a deficient number, since it is larger than the sum of its proper divisors (6332673852697).

111231211220231 is a wasteful number, since it uses less digits than its factorization.

111231211220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111111 (or 111092 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 111231211220231 its reverse (132022112132111), we get a palindrome (243253323352342).

The spelling of 111231211220231 in words is "one hundred eleven trillion, two hundred thirty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred thirty-one".