201111213431 has 2 divisors, whose sum is σ = 201111213432. Its totient is φ = 201111213430.

The previous prime is 201111213379. The next prime is 201111213439. The reversal of 201111213431 is 134312111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201111213431 - 2³⁰ = 200037471607 is a prime.

It is a super-2 number, since 2×201111213431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111213439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555606715 + 100555606716.

It is an arithmetic number, because the mean of its divisors is an integer number (100555606716).

Almost surely, 2^201111213431 is an apocalyptic number.

201111213431 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111213431 is an equidigital number, since it uses as much as digits as its factorization.

201111213431 is an evil number, because the sum of its binary digits is even.

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

Adding to 201111213431 its reverse (134312111102), we get a palindrome (335423324533).

The spelling of 201111213431 in words is "two hundred one billion, one hundred eleven million, two hundred thirteen thousand, four hundred thirty-one".