1311302221 has 8 divisors (see below), whose sum is σ = 1344607488. Its totient is φ = 1278060000.

The previous prime is 1311302173. The next prime is 1311302281. The reversal of 1311302221 is 1222031131.

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 1311302221 - 2²⁹ = 774431309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311302195 and 1311302204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311302281) 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, 27876 + ... + 58306.

It is an arithmetic number, because the mean of its divisors is an integer number (168075936).

Almost surely, 2^1311302221 is an apocalyptic number.

It is an amenable number.

1311302221 is a deficient number, since it is larger than the sum of its proper divisors (33305267).

1311302221 is a wasteful number, since it uses less digits than its factorization.

1311302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31523.

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

The square root of 1311302221 is about 36211.9071715368. The cubic root of 1311302221 is about 1094.5466235374.

Adding to 1311302221 its reverse (1222031131), we get a palindrome (2533333352).

The spelling of 1311302221 in words is "one billion, three hundred eleven million, three hundred two thousand, two hundred twenty-one".