21572059 has 2 divisors, whose sum is σ = 21572060. Its totient is φ = 21572058.

The previous prime is 21572051. The next prime is 21572069. The reversal of 21572059 is 95027512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21572059 - 2³ = 21572051 is a prime.

It is equal to p_1363828 and since 21572059 and 1363828 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21572059.

It is not a weakly prime, because it can be changed into another prime (21572051) 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, 10786029 + 10786030.

It is an arithmetic number, because the mean of its divisors is an integer number (10786030).

Almost surely, 2^21572059 is an apocalyptic number.

21572059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21572059 is an equidigital number, since it uses as much as digits as its factorization.

21572059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 21572059 is about 4644.5730697234. The cubic root of 21572059 is about 278.3751942807.

The spelling of 21572059 in words is "twenty-one million, five hundred seventy-two thousand, fifty-nine".