1320221312 has 32 divisors (see below), whose sum is σ = 2638506420. Its totient is φ = 658008064.

The previous prime is 1320221311. The next prime is 1320221333. The reversal of 1320221312 is 2131220231.

It can be written as a sum of positive squares in 2 ways, for example, as 851238976 + 468982336 = 29176^2 + 21656^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (1320221311) 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, 24308 + ... + 56844.

Almost surely, 2^1320221312 is an apocalyptic number.

It is an amenable number.

1320221312 is a deficient number, since it is larger than the sum of its proper divisors (1318285108).

1320221312 is an equidigital number, since it uses as much as digits as its factorization.

1320221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32868 (or 32856 counting only the distinct ones).

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

The square root of 1320221312 is about 36334.8498276792. The cubic root of 1320221312 is about 1097.0226127934.

Adding to 1320221312 its reverse (2131220231), we get a palindrome (3451441543).

The spelling of 1320221312 in words is "one billion, three hundred twenty million, two hundred twenty-one thousand, three hundred twelve".