21003179 has 2 divisors, whose sum is σ = 21003180. Its totient is φ = 21003178.

The previous prime is 21003173. The next prime is 21003223. The reversal of 21003179 is 97130012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003179 - 2¹⁶ = 20937643 is a prime.

It is a super-2 number, since 2×21003179² = 882267056212082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21003173) 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, 10501589 + 10501590.

It is an arithmetic number, because the mean of its divisors is an integer number (10501590).

Almost surely, 2^21003179 is an apocalyptic number.

21003179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003179 is an equidigital number, since it uses as much as digits as its factorization.

21003179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21003179 is about 4582.9225391665. The cubic root of 21003179 is about 275.9063385547.

The spelling of 21003179 in words is "twenty-one million, three thousand, one hundred seventy-nine".