1211122312331 has 2 divisors, whose sum is σ = 1211122312332. Its totient is φ = 1211122312330.

The previous prime is 1211122312319. The next prime is 1211122312363. The reversal of 1211122312331 is 1332132211121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211122312331 - 2²⁶ = 1211055203467 is a prime.

It is a super-2 number, since 2×1211122312331² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211122312297 and 1211122312306.

It is not a weakly prime, because it can be changed into another prime (1211122312391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605561156165 + 605561156166.

It is an arithmetic number, because the mean of its divisors is an integer number (605561156166).

Almost surely, 2^{1211122312331} is an apocalyptic number.

1211122312331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211122312331 is an equidigital number, since it uses as much as digits as its factorization.

1211122312331 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1211122312331 its reverse (1332132211121), we get a palindrome (2543254523452).

The spelling of 1211122312331 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, three hundred twelve thousand, three hundred thirty-one".