3722221 has 2 divisors, whose sum is σ = 3722222. Its totient is φ = 3722220.

The previous prime is 3722219. The next prime is 3722231. The reversal of 3722221 is 1222273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3348900 + 373321 = 1830^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 3722221 - 2¹ = 3722219 is a prime.

Together with 3722219, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3722231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1861110 + 1861111.

It is an arithmetic number, because the mean of its divisors is an integer number (1861111).

Almost surely, 2^3722221 is an apocalyptic number.

It is an amenable number.

3722221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3722221 is an equidigital number, since it uses as much as digits as its factorization.

3722221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 19.

The square root of 3722221 is about 1929.3058337133. The cubic root of 3722221 is about 154.9770482839.

Adding to 3722221 its reverse (1222273), we get a palindrome (4944494).

The spelling of 3722221 in words is "three million, seven hundred twenty-two thousand, two hundred twenty-one".