1312100213021 has 8 divisors (see below), whose sum is σ = 1413415339224. Its totient is φ = 1210839992640.

The previous prime is 1312100212967. The next prime is 1312100213063. The reversal of 1312100213021 is 1203120012131.

It can be written as a sum of positive squares in 4 ways, for example, as 26792779225 + 1285307433796 = 163685^2 + 1133714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312100213021 - 2¹⁴ = 1312100196637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312100213071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13676810 + ... + 13772411.

It is an arithmetic number, because the mean of its divisors is an integer number (176676917403).

Almost surely, 2^{1312100213021} is an apocalyptic number.

It is an amenable number.

1312100213021 is a deficient number, since it is larger than the sum of its proper divisors (101315126203).

1312100213021 is a wasteful number, since it uses less digits than its factorization.

1312100213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27452911.

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

Adding to 1312100213021 its reverse (1203120012131), we get a palindrome (2515220225152).

The spelling of 1312100213021 in words is "one trillion, three hundred twelve billion, one hundred million, two hundred thirteen thousand, twenty-one".