1320220221 has 16 divisors (see below), whose sum is σ = 1890096768. Its totient is φ = 816704000.

The previous prime is 1320220207. The next prime is 1320220229. The reversal of 1320220221 is 1220220231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1320220221 - 2⁷ = 1320220093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320220229) 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, 178680 + ... + 185921.

It is an arithmetic number, because the mean of its divisors is an integer number (118131048).

Almost surely, 2^1320220221 is an apocalyptic number.

It is an amenable number.

1320220221 is a deficient number, since it is larger than the sum of its proper divisors (569876547).

1320220221 is a wasteful number, since it uses less digits than its factorization.

1320220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364692.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1320220221 is about 36334.8348145413. The cubic root of 1320220221 is about 1097.0223106087.

Adding to 1320220221 its reverse (1220220231), we get a palindrome (2540440452).

The spelling of 1320220221 in words is "one billion, three hundred twenty million, two hundred twenty thousand, two hundred twenty-one".