21869059 has 2 divisors, whose sum is σ = 21869060. Its totient is φ = 21869058.

The previous prime is 21869051. The next prime is 21869077. The reversal of 21869059 is 95096812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21869059 - 2³ = 21869051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21869051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10934529 + 10934530.

It is an arithmetic number, because the mean of its divisors is an integer number (10934530).

Almost surely, 2^21869059 is an apocalyptic number.

21869059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21869059 is an equidigital number, since it uses as much as digits as its factorization.

21869059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 21869059 is about 4676.4365707235. The cubic root of 21869059 is about 279.6469146336.

The spelling of 21869059 in words is "twenty-one million, eight hundred sixty-nine thousand, fifty-nine".