21850259 has 2 divisors, whose sum is σ = 21850260. Its totient is φ = 21850258.

The previous prime is 21850193. The next prime is 21850273. The reversal of 21850259 is 95205812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21850259 - 2¹² = 21846163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21855259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10925129 + 10925130.

It is an arithmetic number, because the mean of its divisors is an integer number (10925130).

Almost surely, 2^21850259 is an apocalyptic number.

21850259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21850259 is an equidigital number, since it uses as much as digits as its factorization.

21850259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 21850259 is about 4674.4260610261. The cubic root of 21850259 is about 279.5667577137.

The spelling of 21850259 in words is "twenty-one million, eight hundred fifty thousand, two hundred fifty-nine".