1313205221 has 8 divisors (see below), whose sum is σ = 1374146424. Its totient is φ = 1253603520.

The previous prime is 1313205209. The next prime is 1313205241. The reversal of 1313205221 is 1225023131.

It can be written as a sum of positive squares in 4 ways, for example, as 790396996 + 522808225 = 28114^2 + 22865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1313205221 - 2¹⁰ = 1313204197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313205193 and 1313205202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313205241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332870 + ... + 336791.

It is an arithmetic number, because the mean of its divisors is an integer number (171768303).

Almost surely, 2^1313205221 is an apocalyptic number.

It is an amenable number.

1313205221 is a deficient number, since it is larger than the sum of its proper divisors (60941203).

1313205221 is an equidigital number, since it uses as much as digits as its factorization.

1313205221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669751.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1313205221 is about 36238.1735328921. The cubic root of 1313205221 is about 1095.0758469317.

Adding to 1313205221 its reverse (1225023131), we get a palindrome (2538228352).

The spelling of 1313205221 in words is "one billion, three hundred thirteen million, two hundred five thousand, two hundred twenty-one".