250666021 has 2 divisors, whose sum is σ = 250666022. Its totient is φ = 250666020.

The previous prime is 250666007. The next prime is 250666027. The reversal of 250666021 is 120666052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183196225 + 67469796 = 13535^2 + 8214^2 .

It is a cyclic number.

It is not a de Polignac number, because 250666021 - 2⁹ = 250665509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250666027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125333010 + 125333011.

It is an arithmetic number, because the mean of its divisors is an integer number (125333011).

Almost surely, 2^250666021 is an apocalyptic number.

It is an amenable number.

250666021 is a deficient number, since it is larger than the sum of its proper divisors (1).

250666021 is an equidigital number, since it uses as much as digits as its factorization.

250666021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 250666021 is about 15832.4357254340. The cubic root of 250666021 is about 630.5194514835.

The spelling of 250666021 in words is "two hundred fifty million, six hundred sixty-six thousand, twenty-one".