1312111221023 has 24 divisors (see below), whose sum is σ = 1413353929680. Its totient is φ = 1214313984000.

The previous prime is 1312111221013. The next prime is 1312111221067. The reversal of 1312111221023 is 3201221112131.

It is not a de Polignac number, because 1312111221023 - 2⁴ = 1312111221007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312111220986 and 1312111221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312111221013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54657023 + ... + 54681023.

It is an arithmetic number, because the mean of its divisors is an integer number (58889747070).

Almost surely, 2^{1312111221023} is an apocalyptic number.

1312111221023 is a deficient number, since it is larger than the sum of its proper divisors (101242708657).

1312111221023 is an equidigital number, since it uses as much as digits as its factorization.

1312111221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24539 (or 24306 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1312111221023 its reverse (3201221112131), we get a palindrome (4513332333154).

The spelling of 1312111221023 in words is "one trillion, three hundred twelve billion, one hundred eleven million, two hundred twenty-one thousand, twenty-three".