2002221 has 24 divisors (see below), whose sum is σ = 3163160. Its totient is φ = 1213056.

The previous prime is 2002211. The next prime is 2002223. The reversal of 2002221 is 1222002.

It can be written as a sum of positive squares in 4 ways, for example, as 72900 + 1929321 = 270^2 + 1389^2 .

It is not a de Polignac number, because 2002221 - 2⁶ = 2002157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12675 + ... + 12831.

2^2002221 is an apocalyptic number.

It is an amenable number.

2002221 is a deficient number, since it is larger than the sum of its proper divisors (1160939).

2002221 is a wasteful number, since it uses less digits than its factorization.

2002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2002221 is about 1414.9985865717. The cubic root of 2002221 is about 126.0387258138.

Adding to 2002221 its reverse (1222002), we get a palindrome (3224223).

The spelling of 2002221 in words is "two million, two thousand, two hundred twenty-one".