1313210221 has 4 divisors (see below), whose sum is σ = 1341150912. Its totient is φ = 1285269532.

The previous prime is 1313210191. The next prime is 1313210233. The reversal of 1313210221 is 1220123131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1313210221 - 2¹³ = 1313202029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313210195 and 1313210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313210281) 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, 13970275 + ... + 13970368.

It is an arithmetic number, because the mean of its divisors is an integer number (335287728).

Almost surely, 2^1313210221 is an apocalyptic number.

It is an amenable number.

1313210221 is a deficient number, since it is larger than the sum of its proper divisors (27940691).

1313210221 is an equidigital number, since it uses as much as digits as its factorization.

1313210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27940690.

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

The square root of 1313210221 is about 36238.2425208508. The cubic root of 1313210221 is about 1095.0772367556.

Adding to 1313210221 its reverse (1220123131), we get a palindrome (2533333352).

The spelling of 1313210221 in words is "one billion, three hundred thirteen million, two hundred ten thousand, two hundred twenty-one".