1215111112231 has 2 divisors, whose sum is σ = 1215111112232. Its totient is φ = 1215111112230.

The previous prime is 1215111112219. The next prime is 1215111112351. The reversal of 1215111112231 is 1322111115121.

It is a m-pointer prime, because the next prime (1215111112351) can be obtained adding 1215111112231 to its product of digits (120).

It is a weak prime.

It is an emirp because it is prime and its reverse (1322111115121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215111112231 - 2³⁵ = 1180751373863 is a prime.

It is a super-2 number, since 2×1215111112231² (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 (1215111113231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607555556115 + 607555556116.

It is an arithmetic number, because the mean of its divisors is an integer number (607555556116).

Almost surely, 2^{1215111112231} is an apocalyptic number.

1215111112231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215111112231 is an equidigital number, since it uses as much as digits as its factorization.

1215111112231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 22.

Adding to 1215111112231 its reverse (1322111115121), we get a palindrome (2537222227352).

The spelling of 1215111112231 in words is "one trillion, two hundred fifteen billion, one hundred eleven million, one hundred twelve thousand, two hundred thirty-one".