1313010221 has 4 divisors (see below), whose sum is σ = 1318645692. Its totient is φ = 1307374752.

The previous prime is 1313010211. The next prime is 1313010233. The reversal of 1313010221 is 1220103131.

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 224670121 + 1088340100 = 14989^2 + 32990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313010221 - 2¹⁰ = 1313009197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1313010196 and 1313010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313010211) 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, 2817386 + ... + 2817851.

It is an arithmetic number, because the mean of its divisors is an integer number (329661423).

Almost surely, 2^1313010221 is an apocalyptic number.

It is an amenable number.

1313010221 is a deficient number, since it is larger than the sum of its proper divisors (5635471).

1313010221 is an equidigital number, since it uses as much as digits as its factorization.

1313010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635470.

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

The square root of 1313010221 is about 36235.4829000525. The cubic root of 1313010221 is about 1095.0216410449.

Adding to 1313010221 its reverse (1220103131), we get a palindrome (2533113352).

The spelling of 1313010221 in words is "one billion, three hundred thirteen million, ten thousand, two hundred twenty-one".