250733221 has 6 divisors (see below), whose sum is σ = 266350130. Its totient is φ = 235983936.

The previous prime is 250733191. The next prime is 250733237. The reversal of 250733221 is 122337052.

It can be written as a sum of positive squares in 3 ways, for example, as 129072321 + 121660900 = 11361^2 + 11030^2 .

It is not a de Polignac number, because 250733221 - 2⁹ = 250732709 is a prime.

It is a super-2 number, since 2×250733221² = 125734296226069682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250733251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433506 + ... + 434083.

Almost surely, 2^250733221 is an apocalyptic number.

It is an amenable number.

250733221 is a deficient number, since it is larger than the sum of its proper divisors (15616909).

250733221 is an equidigital number, since it uses as much as digits as its factorization.

250733221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867623 (or 867606 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 250733221 is about 15834.5578087928. The cubic root of 250733221 is about 630.5757908858.

The spelling of 250733221 in words is "two hundred fifty million, seven hundred thirty-three thousand, two hundred twenty-one".