1313323221 has 8 divisors (see below), whose sum is σ = 2001254464. Its totient is φ = 750470400.

The previous prime is 1313323133. The next prime is 1313323241. The reversal of 1313323221 is 1223233131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1313323221 - 2²⁶ = 1246214357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 62539201 = 1313323221 / (1 + 3 + 1 + 3 + 3 + 2 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313323241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31269580 + ... + 31269621.

It is an arithmetic number, because the mean of its divisors is an integer number (250156808).

Almost surely, 2^1313323221 is an apocalyptic number.

It is an amenable number.

1313323221 is a deficient number, since it is larger than the sum of its proper divisors (687931243).

1313323221 is an equidigital number, since it uses as much as digits as its factorization.

1313323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62539211.

The product of its digits is 648, while the sum is 21.

The square root of 1313323221 is about 36239.8016136954. The cubic root of 1313323221 is about 1095.1086458366.

Adding to 1313323221 its reverse (1223233131), we get a palindrome (2536556352).

The spelling of 1313323221 in words is "one billion, three hundred thirteen million, three hundred twenty-three thousand, two hundred twenty-one".