1312421213 has 4 divisors (see below), whose sum is σ = 1318152540. Its totient is φ = 1306689888.

The previous prime is 1312421203. The next prime is 1312421221. The reversal of 1312421213 is 3121242131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 507961444 + 804459769 = 22538^2 + 28363^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312421213 - 2¹⁰ = 1312420189 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 (1312421203) 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, 2865320 + ... + 2865777.

It is an arithmetic number, because the mean of its divisors is an integer number (329538135).

Almost surely, 2^1312421213 is an apocalyptic number.

It is an amenable number.

1312421213 is a deficient number, since it is larger than the sum of its proper divisors (5731327).

1312421213 is an equidigital number, since it uses as much as digits as its factorization.

1312421213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5731326.

The product of its digits is 288, while the sum is 20.

The square root of 1312421213 is about 36227.3544852505. The cubic root of 1312421213 is about 1094.8578766495.

Adding to 1312421213 its reverse (3121242131), we get a palindrome (4433663344).

The spelling of 1312421213 in words is "one billion, three hundred twelve million, four hundred twenty-one thousand, two hundred thirteen".