2400221 has 2 divisors, whose sum is σ = 2400222. Its totient is φ = 2400220.

The previous prime is 2400197. The next prime is 2400253. The reversal of 2400221 is 1220042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 972196 = 1195^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400221 - 2⁶ = 2400157 is a prime.

It is a super-2 number, since 2×2400221² = 11522121697682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2400271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1200110 + 1200111.

It is an arithmetic number, because the mean of its divisors is an integer number (1200111).

2^2400221 is an apocalyptic number.

It is an amenable number.

2400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2400221 is an equidigital number, since it uses as much as digits as its factorization.

2400221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2400221 is about 1549.2646642843. The cubic root of 2400221 is about 133.8906994648.

Adding to 2400221 its reverse (1220042), we get a palindrome (3620263).

The spelling of 2400221 in words is "two million, four hundred thousand, two hundred twenty-one".