1311013221 has 16 divisors (see below), whose sum is σ = 1998441984. Its totient is φ = 748885104.

The previous prime is 1311013211. The next prime is 1311013261. The reversal of 1311013221 is 1223101131.

It is a happy number.

It is not a de Polignac number, because 1311013221 - 2⁹ = 1311012709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311013211) 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, 60390 + ... + 79176.

It is an arithmetic number, because the mean of its divisors is an integer number (124902624).

Almost surely, 2^1311013221 is an apocalyptic number.

It is an amenable number.

1311013221 is a deficient number, since it is larger than the sum of its proper divisors (687428763).

1311013221 is a wasteful number, since it uses less digits than its factorization.

1311013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22120.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311013221 is about 36207.9165514946. The cubic root of 1311013221 is about 1094.4662080007.

Adding to 1311013221 its reverse (1223101131), we get a palindrome (2534114352).

The spelling of 1311013221 in words is "one billion, three hundred eleven million, thirteen thousand, two hundred twenty-one".