250028021 has 2 divisors, whose sum is σ = 250028022. Its totient is φ = 250028020.

The previous prime is 250028003. The next prime is 250028029. The reversal of 250028021 is 120820052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249324100 + 703921 = 15790^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 250028021 - 2¹⁴ = 250011637 is a prime.

It is a super-2 number, since 2×250028021² = 125028022570352882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 250027984 and 250028002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250028029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125014010 + 125014011.

It is an arithmetic number, because the mean of its divisors is an integer number (125014011).

Almost surely, 2^250028021 is an apocalyptic number.

It is an amenable number.

250028021 is a deficient number, since it is larger than the sum of its proper divisors (1).

250028021 is an equidigital number, since it uses as much as digits as its factorization.

250028021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 250028021 is about 15812.2743778370. The cubic root of 250028021 is about 629.9840602333.

Adding to 250028021 its reverse (120820052), we get a palindrome (370848073).

The spelling of 250028021 in words is "two hundred fifty million, twenty-eight thousand, twenty-one".