1311973221 has 8 divisors (see below), whose sum is σ = 1883859040. Its totient is φ = 807368112.

The previous prime is 1311973207. The next prime is 1311973241. The reversal of 1311973221 is 1223791131.

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

It is not a de Polignac number, because 1311973221 - 2⁵ = 1311973189 is a prime.

It is a super-2 number, since 2×1311973221² = 3442547465242229682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311973241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16820131 + ... + 16820208.

It is an arithmetic number, because the mean of its divisors is an integer number (235482380).

Almost surely, 2^1311973221 is an apocalyptic number.

It is an amenable number.

1311973221 is a deficient number, since it is larger than the sum of its proper divisors (571885819).

1311973221 is a wasteful number, since it uses less digits than its factorization.

1311973221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33640355.

The product of its digits is 2268, while the sum is 30.

The square root of 1311973221 is about 36221.1708949338. The cubic root of 1311973221 is about 1094.7332867225.

The spelling of 1311973221 in words is "one billion, three hundred eleven million, nine hundred seventy-three thousand, two hundred twenty-one".