1111220111231 has 2 divisors, whose sum is σ = 1111220111232. Its totient is φ = 1111220111230.

The previous prime is 1111220111189. The next prime is 1111220111299. The reversal of 1111220111231 is 1321110221111.

It is a weak prime.

It is an emirp because it is prime and its reverse (1321110221111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111220111231 - 2¹⁰ = 1111220110207 is a prime.

It is a super-2 number, since 2×1111220111231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111229111231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555610055615 + 555610055616.

It is an arithmetic number, because the mean of its divisors is an integer number (555610055616).

Almost surely, 2^{1111220111231} is an apocalyptic number.

1111220111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111220111231 is an equidigital number, since it uses as much as digits as its factorization.

1111220111231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1111220111231 its reverse (1321110221111), we get a palindrome (2432330332342).

The spelling of 1111220111231 in words is "one trillion, one hundred eleven billion, two hundred twenty million, one hundred eleven thousand, two hundred thirty-one".