2042221 has 2 divisors, whose sum is σ = 2042222. Its totient is φ = 2042220.

The previous prime is 2042213. The next prime is 2042233. The reversal of 2042221 is 1222402.

2042221 = 1010² + 1011².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 1020100 = 1011^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042221 - 2³ = 2042213 is a prime.

It is a super-2 number, since 2×2042221² = 8341333225682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2042281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021110 + 1021111.

It is an arithmetic number, because the mean of its divisors is an integer number (1021111).

2^2042221 is an apocalyptic number.

2042221 is the 1011-st centered square number.

It is an amenable number.

2042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042221 is an equidigital number, since it uses as much as digits as its factorization.

2042221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2042221 is about 1429.0629797178. The cubic root of 2042221 is about 126.8725238340.

Adding to 2042221 its reverse (1222402), we get a palindrome (3264623).

The spelling of 2042221 in words is "two million, forty-two thousand, two hundred twenty-one".