21579059 has 2 divisors, whose sum is σ = 21579060. Its totient is φ = 21579058.

The previous prime is 21579053. The next prime is 21579067. The reversal of 21579059 is 95097512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21579059 - 2⁴ = 21579043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21579053) 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, 10789529 + 10789530.

It is an arithmetic number, because the mean of its divisors is an integer number (10789530).

Almost surely, 2^21579059 is an apocalyptic number.

21579059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21579059 is an equidigital number, since it uses as much as digits as its factorization.

21579059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 21579059 is about 4645.3265762484. The cubic root of 21579059 is about 278.4053013686.

The spelling of 21579059 in words is "twenty-one million, five hundred seventy-nine thousand, fifty-nine".