1313120221 has 16 divisors (see below), whose sum is σ = 1546829568. Its totient is φ = 1091462400.

The previous prime is 1313120219. The next prime is 1313120251. The reversal of 1313120221 is 1220213131.

It is not a de Polignac number, because 1313120221 - 2¹ = 1313120219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313120195 and 1313120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313120201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8661 + ... + 51973.

It is an arithmetic number, because the mean of its divisors is an integer number (96676848).

Almost surely, 2^1313120221 is an apocalyptic number.

It is an amenable number.

1313120221 is a deficient number, since it is larger than the sum of its proper divisors (233709347).

1313120221 is an equidigital number, since it uses as much as digits as its factorization.

1313120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43452.

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

The square root of 1313120221 is about 36237.0007174987. Note that the first 3 decimals coincide. The cubic root of 1313120221 is about 1095.0522193844.

Adding to 1313120221 its reverse (1220213131), we get a palindrome (2533333352).

The spelling of 1313120221 in words is "one billion, three hundred thirteen million, one hundred twenty thousand, two hundred twenty-one".