1320901221 has 16 divisors (see below), whose sum is σ = 1809864000. Its totient is φ = 856297728.

The previous prime is 1320901213. The next prime is 1320901229. The reversal of 1320901221 is 1221090231.

It is an interprime number because it is at equal distance from previous prime (1320901213) and next prime (1320901229).

It is not a de Polignac number, because 1320901221 - 2³ = 1320901213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320901229) 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, 324205 + ... + 328253.

It is an arithmetic number, because the mean of its divisors is an integer number (113116500).

Almost surely, 2^1320901221 is an apocalyptic number.

It is an amenable number.

1320901221 is a deficient number, since it is larger than the sum of its proper divisors (488962779).

1320901221 is a wasteful number, since it uses less digits than its factorization.

1320901221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7028.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1320901221 is about 36344.2047787539. The cubic root of 1320901221 is about 1097.2109013115.

Adding to 1320901221 its reverse (1221090231), we get a palindrome (2541991452).

The spelling of 1320901221 in words is "one billion, three hundred twenty million, nine hundred one thousand, two hundred twenty-one".