1312423221 has 4 divisors (see below), whose sum is σ = 1749897632. Its totient is φ = 874948812.

The previous prime is 1312423213. The next prime is 1312423237. The reversal of 1312423221 is 1223242131.

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 not a de Polignac number, because 1312423221 - 2³ = 1312423213 is a prime.

It is a super-2 number, since 2×1312423221² = 3444909422040029682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312423121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218737201 + ... + 218737206.

It is an arithmetic number, because the mean of its divisors is an integer number (437474408).

Almost surely, 2^1312423221 is an apocalyptic number.

It is an amenable number.

1312423221 is a deficient number, since it is larger than the sum of its proper divisors (437474411).

1312423221 is an equidigital number, since it uses as much as digits as its factorization.

1312423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437474410.

The product of its digits is 576, while the sum is 21.

The square root of 1312423221 is about 36227.3821991046. The cubic root of 1312423221 is about 1094.8584350255.

Adding to 1312423221 its reverse (1223242131), we get a palindrome (2535665352).

The spelling of 1312423221 in words is "one billion, three hundred twelve million, four hundred twenty-three thousand, two hundred twenty-one".