1312341021 has 20 divisors (see below), whose sum is σ = 1962681952. Its totient is φ = 873880488.

The previous prime is 1312341013. The next prime is 1312341053. The reversal of 1312341021 is 1201432131.

It is not a de Polignac number, because 1312341021 - 2³ = 1312341013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312340985 and 1312341003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312351021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64536 + ... + 82398.

Almost surely, 2^1312341021 is an apocalyptic number.

It is an amenable number.

1312341021 is a deficient number, since it is larger than the sum of its proper divisors (650340931).

1312341021 is an equidigital number, since it uses as much as digits as its factorization.

1312341021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18782 (or 18773 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1312341021 is about 36226.2476803767. The cubic root of 1312341021 is about 1094.8355767379.

Adding to 1312341021 its reverse (1201432131), we get a palindrome (2513773152).

The spelling of 1312341021 in words is "one billion, three hundred twelve million, three hundred forty-one thousand, twenty-one".