1320221231 has 8 divisors (see below), whose sum is σ = 1533559584. Its totient is φ = 1113066720.

The previous prime is 1320221209. The next prime is 1320221233. The reversal of 1320221231 is 1321220231.

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 1320221231 - 2¹⁰ = 1320220207 is a prime.

It is a super-2 number, since 2×1320221231² = 3485968197566310722, 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 (1320221233) 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, 1545500 + ... + 1546353.

It is an arithmetic number, because the mean of its divisors is an integer number (191694948).

Almost surely, 2^1320221231 is an apocalyptic number.

1320221231 is a deficient number, since it is larger than the sum of its proper divisors (213338353).

1320221231 is an equidigital number, since it uses as much as digits as its factorization.

1320221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091921.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1320221231 is about 36334.8487130468. The cubic root of 1320221231 is about 1097.0225903580.

Adding to 1320221231 its reverse (1321220231), we get a palindrome (2641441462).

The spelling of 1320221231 in words is "one billion, three hundred twenty million, two hundred twenty-one thousand, two hundred thirty-one".