1310221321 has 4 divisors (see below), whose sum is σ = 1334942532. Its totient is φ = 1285500112.

The previous prime is 1310221279. The next prime is 1310221343. The reversal of 1310221321 is 1231220131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231220131 = 47 ⋅26196173.

It can be written as a sum of positive squares in 2 ways, for example, as 919605625 + 390615696 = 30325^2 + 19764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1310221321 - 2¹⁵ = 1310188553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1310221295 and 1310221304.

It is not an unprimeable number, because it can be changed into a prime (1310221721) 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, 12360526 + ... + 12360631.

It is an arithmetic number, because the mean of its divisors is an integer number (333735633).

Almost surely, 2^1310221321 is an apocalyptic number.

It is an amenable number.

1310221321 is a deficient number, since it is larger than the sum of its proper divisors (24721211).

1310221321 is an equidigital number, since it uses as much as digits as its factorization.

1310221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24721210.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1310221321 is about 36196.9794458046. The cubic root of 1310221321 is about 1094.2457977250.

Adding to 1310221321 its reverse (1231220131), we get a palindrome (2541441452).

The spelling of 1310221321 in words is "one billion, three hundred ten million, two hundred twenty-one thousand, three hundred twenty-one".