250442221 has 2 divisors, whose sum is σ = 250442222. Its totient is φ = 250442220.

The previous prime is 250442219. The next prime is 250442243. The reversal of 250442221 is 122244052.

It is an a-pointer prime, because the next prime (250442243) can be obtained adding 250442221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195608196 + 54834025 = 13986^2 + 7405^2 .

It is a cyclic number.

It is not a de Polignac number, because 250442221 - 2¹ = 250442219 is a prime.

Together with 250442219, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_13702171 and since 250442221 and 13702171 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 250442192 and 250442201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250442201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125221110 + 125221111.

It is an arithmetic number, because the mean of its divisors is an integer number (125221111).

Almost surely, 2^250442221 is an apocalyptic number.

It is an amenable number.

250442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

250442221 is an equidigital number, since it uses as much as digits as its factorization.

250442221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 250442221 is about 15825.3663780653. The cubic root of 250442221 is about 630.3317485140.

Adding to 250442221 its reverse (122244052), we get a palindrome (372686273).

The spelling of 250442221 in words is "two hundred fifty million, four hundred forty-two thousand, two hundred twenty-one".