1320332221 has 4 divisors (see below), whose sum is σ = 1421896252. Its totient is φ = 1218768192.

The previous prime is 1320332147. The next prime is 1320332231. The reversal of 1320332221 is 1222330231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222330231 = 33739 ⋅36229.

It can be written as a sum of positive squares in 2 ways, for example, as 163584100 + 1156748121 = 12790^2 + 34011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320332221 - 2¹³ = 1320324029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320332231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50781996 + ... + 50782021.

It is an arithmetic number, because the mean of its divisors is an integer number (355474063).

Almost surely, 2^1320332221 is an apocalyptic number.

It is an amenable number.

1320332221 is a deficient number, since it is larger than the sum of its proper divisors (101564031).

1320332221 is a wasteful number, since it uses less digits than its factorization.

1320332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101564030.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1320332221 is about 36336.3760025680. The cubic root of 1320332221 is about 1097.0533314496.

Adding to 1320332221 its reverse (1222330231), we get a palindrome (2542662452).

The spelling of 1320332221 in words is "one billion, three hundred twenty million, three hundred thirty-two thousand, two hundred twenty-one".