1313202221 has 4 divisors (see below), whose sum is σ = 1313408700. Its totient is φ = 1312995744.

The previous prime is 1313202217. The next prime is 1313202223. The reversal of 1313202221 is 1222023131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1269496900 + 43705321 = 35630^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313202221 - 2² = 1313202217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1313202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313202223) 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, 93386 + ... + 106523.

It is an arithmetic number, because the mean of its divisors is an integer number (328352175).

Almost surely, 2^1313202221 is an apocalyptic number.

It is an amenable number.

1313202221 is a deficient number, since it is larger than the sum of its proper divisors (206479).

1313202221 is an equidigital number, since it uses as much as digits as its factorization.

1313202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206478.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1313202221 is about 36238.1321400538. The cubic root of 1313202221 is about 1095.0750130356.

Adding to 1313202221 its reverse (1222023131), we get a palindrome (2535225352).

The spelling of 1313202221 in words is "one billion, three hundred thirteen million, two hundred two thousand, two hundred twenty-one".