1312430021 has 16 divisors (see below), whose sum is σ = 1538334720. Its totient is φ = 1096332720.

The previous prime is 1312430011. The next prime is 1312430023. The reversal of 1312430021 is 1200342131.

It is not a de Polignac number, because 1312430021 - 2²² = 1308235717 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 (1312430023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70286 + ... + 86976.

It is an arithmetic number, because the mean of its divisors is an integer number (96145920).

Almost surely, 2^1312430021 is an apocalyptic number.

It is an amenable number.

1312430021 is a deficient number, since it is larger than the sum of its proper divisors (225904699).

1312430021 is a wasteful number, since it uses less digits than its factorization.

1312430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16984.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1312430021 is about 36227.4760506442. The cubic root of 1312430021 is about 1094.8603259360.

Adding to 1312430021 its reverse (1200342131), we get a palindrome (2512772152).

The spelling of 1312430021 in words is "one billion, three hundred twelve million, four hundred thirty thousand, twenty-one".