2221321 has 2 divisors, whose sum is σ = 2221322. Its totient is φ = 2221320.

The previous prime is 2221301. The next prime is 2221333. The reversal of 2221321 is 1231222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 230400 = 1411^2 + 480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221321 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110660 + 1110661.

It is an arithmetic number, because the mean of its divisors is an integer number (1110661).

2^2221321 is an apocalyptic number.

It is an amenable number.

2221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221321 is an equidigital number, since it uses as much as digits as its factorization.

2221321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 13.

The square root of 2221321 is about 1490.4096752236. The cubic root of 2221321 is about 130.4779448251.

Adding to 2221321 its reverse (1231222), we get a palindrome (3452543).

Subtracting from 2221321 its reverse (1231222), we obtain a palindrome (990099).

The spelling of 2221321 in words is "two million, two hundred twenty-one thousand, three hundred twenty-one".