250021901 has 2 divisors, whose sum is σ = 250021902. Its totient is φ = 250021900.

The previous prime is 250021867. The next prime is 250021903. The reversal of 250021901 is 109120052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135745801 + 114276100 = 11651^2 + 10690^2 .

It is a cyclic number.

It is not a de Polignac number, because 250021901 - 2²² = 245827597 is a prime.

Together with 250021903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250021903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125010950 + 125010951.

It is an arithmetic number, because the mean of its divisors is an integer number (125010951).

Almost surely, 2^250021901 is an apocalyptic number.

It is an amenable number.

250021901 is a deficient number, since it is larger than the sum of its proper divisors (1).

250021901 is an equidigital number, since it uses as much as digits as its factorization.

250021901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 250021901 is about 15812.0808561049. The cubic root of 250021901 is about 629.9789200976.

Adding to 250021901 its reverse (109120052), we get a palindrome (359141953).

The spelling of 250021901 in words is "two hundred fifty million, twenty-one thousand, nine hundred one".