1231222131331 has 4 divisors (see below), whose sum is σ = 1231227824632. Its totient is φ = 1231216438032.

The previous prime is 1231222131313. The next prime is 1231222131343. The reversal of 1231222131331 is 1331312221321.

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 1231222131331 - 2¹³ = 1231222123139 is a prime.

It is a super-2 number, since 2×1231222131331² (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 = 1231222131296 and 1231222131305.

It is not an unprimeable number, because it can be changed into a prime (1231222131431) 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, 2508906 + ... + 2959231.

It is an arithmetic number, because the mean of its divisors is an integer number (307806956158).

Almost surely, 2^{1231222131331} is an apocalyptic number.

1231222131331 is a deficient number, since it is larger than the sum of its proper divisors (5693301).

1231222131331 is an equidigital number, since it uses as much as digits as its factorization.

1231222131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5693300.

The product of its digits is 1296, while the sum is 25.

Adding to 1231222131331 its reverse (1331312221321), we get a palindrome (2562534352652).

The spelling of 1231222131331 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, three hundred thirty-one".