1213321313 has 4 divisors (see below), whose sum is σ = 1213392048. Its totient is φ = 1213250580.

The previous prime is 1213321303. The next prime is 1213321381. The reversal of 1213321313 is 3131233121.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3131233121 = 10331 ⋅303091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213321313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213321303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8498 + ... + 49988.

It is an arithmetic number, because the mean of its divisors is an integer number (303348012).

Almost surely, 2^1213321313 is an apocalyptic number.

It is an amenable number.

1213321313 is a deficient number, since it is larger than the sum of its proper divisors (70735).

1213321313 is an equidigital number, since it uses as much as digits as its factorization.

1213321313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70734.

The product of its digits is 324, while the sum is 20.

The square root of 1213321313 is about 34832.7620638961. The cubic root of 1213321313 is about 1066.5763318789.

Adding to 1213321313 its reverse (3131233121), we get a palindrome (4344554434).

The spelling of 1213321313 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, three hundred thirteen".