250440221 has 2 divisors, whose sum is σ = 250440222. Its totient is φ = 250440220.

The previous prime is 250440199. The next prime is 250440257. The reversal of 250440221 is 122044052.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241802500 + 8637721 = 15550^2 + 2939^2 .

It is a cyclic number.

It is not a de Polignac number, because 250440221 - 2¹⁰ = 250439197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 250440193 and 250440202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250442221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125220110 + 125220111.

It is an arithmetic number, because the mean of its divisors is an integer number (125220111).

Almost surely, 2^250440221 is an apocalyptic number.

It is an amenable number.

250440221 is a deficient number, since it is larger than the sum of its proper divisors (1).

250440221 is an equidigital number, since it uses as much as digits as its factorization.

250440221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 250440221 is about 15825.3031882489. The cubic root of 250440221 is about 630.3300705929.

Adding to 250440221 its reverse (122044052), we get a palindrome (372484273).

The spelling of 250440221 in words is "two hundred fifty million, four hundred forty thousand, two hundred twenty-one".