1313100221 has 4 divisors (see below), whose sum is σ = 1313182332. Its totient is φ = 1313018112.

The previous prime is 1313100211. The next prime is 1313100227. The reversal of 1313100221 is 1220013131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 624300196 + 688800025 = 24986^2 + 26245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313100221 - 2¹⁸ = 1312838077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313100196 and 1313100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313100227) 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, 8420 + ... + 51933.

It is an arithmetic number, because the mean of its divisors is an integer number (328295583).

Almost surely, 2^1313100221 is an apocalyptic number.

It is an amenable number.

1313100221 is a deficient number, since it is larger than the sum of its proper divisors (82111).

1313100221 is an equidigital number, since it uses as much as digits as its factorization.

1313100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82110.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1313100221 is about 36236.7247554191. The cubic root of 1313100221 is about 1095.0466598133.

Adding to 1313100221 its reverse (1220013131), we get a palindrome (2533113352).

The spelling of 1313100221 in words is "one billion, three hundred thirteen million, one hundred thousand, two hundred twenty-one".