1131321212231 has 4 divisors (see below), whose sum is σ = 1292938528272. Its totient is φ = 969703896192.

The previous prime is 1131321212213. The next prime is 1131321212237. The reversal of 1131321212231 is 1322121231311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1131321212231 - 2³⁸ = 856443305287 is a prime.

It is a super-2 number, since 2×1131321212231² (a number of 25 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 = 1131321212197 and 1131321212206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131321212237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80808658010 + ... + 80808658023.

It is an arithmetic number, because the mean of its divisors is an integer number (323234632068).

Almost surely, 2^{1131321212231} is an apocalyptic number.

1131321212231 is a deficient number, since it is larger than the sum of its proper divisors (161617316041).

1131321212231 is an equidigital number, since it uses as much as digits as its factorization.

1131321212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161617316040.

The product of its digits is 432, while the sum is 23.

Adding to 1131321212231 its reverse (1322121231311), we get a palindrome (2453442443542).

The spelling of 1131321212231 in words is "one trillion, one hundred thirty-one billion, three hundred twenty-one million, two hundred twelve thousand, two hundred thirty-one".