1312122323111 has 4 divisors (see below), whose sum is σ = 1369171119792. Its totient is φ = 1255073526432.

The previous prime is 1312122323069. The next prime is 1312122323117. The reversal of 1312122323111 is 1113232212131.

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 1312122323111 - 2¹⁰ = 1312122322087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 57048796657 = 1312122323111 / (1 + 3 + 1 + 2 + 1 + 2 + 2 + 3 + 2 + 3 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312122323117) 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, 28524398306 + ... + 28524398351.

It is an arithmetic number, because the mean of its divisors is an integer number (342292779948).

Almost surely, 2^{1312122323111} is an apocalyptic number.

1312122323111 is a deficient number, since it is larger than the sum of its proper divisors (57048796681).

1312122323111 is an equidigital number, since it uses as much as digits as its factorization.

1312122323111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57048796680.

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

Adding to 1312122323111 its reverse (1113232212131), we get a palindrome (2425354535242).

The spelling of 1312122323111 in words is "one trillion, three hundred twelve billion, one hundred twenty-two million, three hundred twenty-three thousand, one hundred eleven".