1312511201021 has 4 divisors (see below), whose sum is σ = 1312513888992. Its totient is φ = 1312508513052.

The previous prime is 1312511201017. The next prime is 1312511201059. The reversal of 1312511201021 is 1201021152131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1312511201021 - 2² = 1312511201017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312511200984 and 1312511201002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312511201321) 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, 382055 + ... + 1664628.

It is an arithmetic number, because the mean of its divisors is an integer number (328128472248).

Almost surely, 2^{1312511201021} is an apocalyptic number.

It is an amenable number.

1312511201021 is a deficient number, since it is larger than the sum of its proper divisors (2687971).

1312511201021 is an equidigital number, since it uses as much as digits as its factorization.

1312511201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687970.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 1312511201021 its reverse (1201021152131), we get a palindrome (2513532353152).

The spelling of 1312511201021 in words is "one trillion, three hundred twelve billion, five hundred eleven million, two hundred one thousand, twenty-one".