240204221 has 2 divisors, whose sum is σ = 240204222. Its totient is φ = 240204220.

The previous prime is 240204143. The next prime is 240204229. The reversal of 240204221 is 122402042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225420196 + 14784025 = 15014^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 240204221 - 2²⁶ = 173095357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 240204221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240204229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120102110 + 120102111.

It is an arithmetic number, because the mean of its divisors is an integer number (120102111).

Almost surely, 2^240204221 is an apocalyptic number.

It is an amenable number.

240204221 is a deficient number, since it is larger than the sum of its proper divisors (1).

240204221 is an equidigital number, since it uses as much as digits as its factorization.

240204221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 240204221 is about 15498.5231877105. The cubic root of 240204221 is about 621.6227184761.

Adding to 240204221 its reverse (122402042), we get a palindrome (362606263).

The spelling of 240204221 in words is "two hundred forty million, two hundred four thousand, two hundred twenty-one".