21750059 has 2 divisors, whose sum is σ = 21750060. Its totient is φ = 21750058.

The previous prime is 21750037. The next prime is 21750073. The reversal of 21750059 is 95005712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21750059 - 2²⁴ = 4972843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21750959) 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, 10875029 + 10875030.

It is an arithmetic number, because the mean of its divisors is an integer number (10875030).

Almost surely, 2^21750059 is an apocalyptic number.

21750059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21750059 is an equidigital number, since it uses as much as digits as its factorization.

21750059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 21750059 is about 4663.6958520041. The cubic root of 21750059 is about 279.1387609838.

The spelling of 21750059 in words is "twenty-one million, seven hundred fifty thousand, fifty-nine".