21230179 has 2 divisors, whose sum is σ = 21230180. Its totient is φ = 21230178.

The previous prime is 21230177. The next prime is 21230203. The reversal of 21230179 is 97103212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230179 - 2¹ = 21230177 is a prime.

Together with 21230177, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21230171) 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, 10615089 + 10615090.

It is an arithmetic number, because the mean of its divisors is an integer number (10615090).

Almost surely, 2^21230179 is an apocalyptic number.

21230179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230179 is an equidigital number, since it uses as much as digits as its factorization.

21230179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21230179 is about 4607.6218377814. The cubic root of 21230179 is about 276.8967671724.

The spelling of 21230179 in words is "twenty-one million, two hundred thirty thousand, one hundred seventy-nine".