1301306221 has 4 divisors (see below), whose sum is σ = 1301852412. Its totient is φ = 1300760032.

The previous prime is 1301306203. The next prime is 1301306231. The reversal of 1301306221 is 1226031031.

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 619312996 + 681993225 = 24886^2 + 26115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1301306221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301306231) 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, 269506 + ... + 274291.

It is an arithmetic number, because the mean of its divisors is an integer number (325463103).

Almost surely, 2^1301306221 is an apocalyptic number.

It is an amenable number.

1301306221 is a deficient number, since it is larger than the sum of its proper divisors (546191).

1301306221 is an equidigital number, since it uses as much as digits as its factorization.

1301306221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546190.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1301306221 is about 36073.6222328726. The cubic root of 1301306221 is about 1091.7582992394.

Adding to 1301306221 its reverse (1226031031), we get a palindrome (2527337252).

The spelling of 1301306221 in words is "one billion, three hundred one million, three hundred six thousand, two hundred twenty-one".