1313133032221 has 4 divisors (see below), whose sum is σ = 1318581717244. Its totient is φ = 1307684347200.

The previous prime is 1313133032173. The next prime is 1313133032257. The reversal of 1313133032221 is 1222303313131.

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 378409522500 + 934723509721 = 615150^2 + 966811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313133032221 - 2²³ = 1313124643613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313133032921) 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, 2724342150 + ... + 2724342631.

It is an arithmetic number, because the mean of its divisors is an integer number (329645429311).

Almost surely, 2^{1313133032221} is an apocalyptic number.

It is an amenable number.

1313133032221 is a deficient number, since it is larger than the sum of its proper divisors (5448685023).

1313133032221 is an equidigital number, since it uses as much as digits as its factorization.

1313133032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5448685022.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1313133032221 its reverse (1222303313131), we get a palindrome (2535436345352).

The spelling of 1313133032221 in words is "one trillion, three hundred thirteen billion, one hundred thirty-three million, thirty-two thousand, two hundred twenty-one".