1312103012021 has 4 divisors (see below), whose sum is σ = 1357347943500. Its totient is φ = 1266858080544.

The previous prime is 1312103012009. The next prime is 1312103012029. The reversal of 1312103012021 is 1202103012131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 553878292900 + 758224719121 = 744230^2 + 870761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312103012021 - 2¹⁰ = 1312103010997 is a prime.

It is a super-2 number, since 2×1312103012021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312103012029) 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, 22622465696 + ... + 22622465753.

It is an arithmetic number, because the mean of its divisors is an integer number (339336985875).

Almost surely, 2^{1312103012021} is an apocalyptic number.

It is an amenable number.

1312103012021 is a deficient number, since it is larger than the sum of its proper divisors (45244931479).

1312103012021 is an equidigital number, since it uses as much as digits as its factorization.

1312103012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45244931478.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1312103012021 its reverse (1202103012131), we get a palindrome (2514206024152).

The spelling of 1312103012021 in words is "one trillion, three hundred twelve billion, one hundred three million, twelve thousand, twenty-one".