1310320221 has 12 divisors (see below), whose sum is σ = 2032333632. Its totient is φ = 748754328.

The previous prime is 1310320157. The next prime is 1310320223. The reversal of 1310320221 is 1220230131.

It is not a de Polignac number, because 1310320221 - 2⁶ = 1310320157 is a prime.

It is a super-2 number, since 2×1310320221² = 3433878163122977682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1310320221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310320223) 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 11 ways as a sum of consecutive naturals, for example, 4456725 + ... + 4457018.

It is an arithmetic number, because the mean of its divisors is an integer number (169361136).

Almost surely, 2^1310320221 is an apocalyptic number.

It is an amenable number.

1310320221 is a deficient number, since it is larger than the sum of its proper divisors (722013411).

1310320221 is an equidigital number, since it uses as much as digits as its factorization.

1310320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913760 (or 8913753 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1310320221 is about 36198.3455561162. The cubic root of 1310320221 is about 1094.2733295079.

Adding to 1310320221 its reverse (1220230131), we get a palindrome (2530550352).

The spelling of 1310320221 in words is "one billion, three hundred ten million, three hundred twenty thousand, two hundred twenty-one".