1312242413221 has 4 divisors (see below), whose sum is σ = 1312258295200. Its totient is φ = 1312226531244.

The previous prime is 1312242413203. The next prime is 1312242413267. The reversal of 1312242413221 is 1223142422131.

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 1312242413221 - 2⁷ = 1312242413093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312242413221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312242213221) 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, 7816401 + ... + 7982518.

It is an arithmetic number, because the mean of its divisors is an integer number (328064573800).

Almost surely, 2^{1312242413221} is an apocalyptic number.

It is an amenable number.

1312242413221 is a deficient number, since it is larger than the sum of its proper divisors (15881979).

1312242413221 is an equidigital number, since it uses as much as digits as its factorization.

1312242413221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15881978.

The product of its digits is 4608, while the sum is 28.

Adding to 1312242413221 its reverse (1223142422131), we get a palindrome (2535384835352).

The spelling of 1312242413221 in words is "one trillion, three hundred twelve billion, two hundred forty-two million, four hundred thirteen thousand, two hundred twenty-one".