21900059 has 2 divisors, whose sum is σ = 21900060. Its totient is φ = 21900058.

The previous prime is 21900049. The next prime is 21900091. The reversal of 21900059 is 95000912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21900059 - 2⁸ = 21899803 is a prime.

It is a super-2 number, since 2×21900059² = 959225168406962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21900019) 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, 10950029 + 10950030.

It is an arithmetic number, because the mean of its divisors is an integer number (10950030).

Almost surely, 2^21900059 is an apocalyptic number.

21900059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21900059 is an equidigital number, since it uses as much as digits as its factorization.

21900059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 21900059 is about 4679.7498864790. The cubic root of 21900059 is about 279.7789880098.

The spelling of 21900059 in words is "twenty-one million, nine hundred thousand, fifty-nine".