11131211121231 has 16 divisors (see below), whose sum is σ = 15052909903200. Its totient is φ = 7315654714368.

The previous prime is 11131211121227. The next prime is 11131211121281. The reversal of 11131211121231 is 13212111213111.

It is not a de Polignac number, because 11131211121231 - 2² = 11131211121227 is a prime.

It is a super-2 number, since 2×11131211121231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11131211121198 and 11131211121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131211121281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61764516 + ... + 61944473.

It is an arithmetic number, because the mean of its divisors is an integer number (940806868950).

Almost surely, 2^{11131211121231} is an apocalyptic number.

11131211121231 is a deficient number, since it is larger than the sum of its proper divisors (3921698781969).

11131211121231 is a wasteful number, since it uses less digits than its factorization.

11131211121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123709418.

The product of its digits is 72, while the sum is 21.

Adding to 11131211121231 its reverse (13212111213111), we get a palindrome (24343322334342).

The spelling of 11131211121231 in words is "eleven trillion, one hundred thirty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred thirty-one".