1321212121313 has 4 divisors (see below), whose sum is σ = 1509956710080. Its totient is φ = 1132467532548.

The previous prime is 1321212121297. The next prime is 1321212121373. The reversal of 1321212121313 is 3131212121231.

It is a happy number.

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 1321212121313 - 2⁴ = 1321212121297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321212121373) 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, 94372294373 + ... + 94372294386.

It is an arithmetic number, because the mean of its divisors is an integer number (377489177520).

Almost surely, 2^{1321212121313} is an apocalyptic number.

It is an amenable number.

1321212121313 is a deficient number, since it is larger than the sum of its proper divisors (188744588767).

1321212121313 is an equidigital number, since it uses as much as digits as its factorization.

1321212121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188744588766.

The product of its digits is 432, while the sum is 23.

Adding to 1321212121313 its reverse (3131212121231), we get a palindrome (4452424242544).

The spelling of 1321212121313 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred thirteen".