21056179 has 2 divisors, whose sum is σ = 21056180. Its totient is φ = 21056178.

The previous prime is 21056171. The next prime is 21056227. The reversal of 21056179 is 97165012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21056179 - 2³ = 21056171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21056179.

It is not a weakly prime, because it can be changed into another prime (21056171) 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, 10528089 + 10528090.

It is an arithmetic number, because the mean of its divisors is an integer number (10528090).

Almost surely, 2^21056179 is an apocalyptic number.

21056179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21056179 is an equidigital number, since it uses as much as digits as its factorization.

21056179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 21056179 is about 4588.7012323750. The cubic root of 21056179 is about 276.1382201681.

The spelling of 21056179 in words is "twenty-one million, fifty-six thousand, one hundred seventy-nine".