21086179 has 2 divisors, whose sum is σ = 21086180. Its totient is φ = 21086178.

The previous prime is 21086141. The next prime is 21086201. The reversal of 21086179 is 97168012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21086179 - 2¹⁵ = 21053411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21086129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10543089 + 10543090.

It is an arithmetic number, because the mean of its divisors is an integer number (10543090).

Almost surely, 2^21086179 is an apocalyptic number.

21086179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21086179 is an equidigital number, since it uses as much as digits as its factorization.

21086179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21086179 is about 4591.9689676652. The cubic root of 21086179 is about 276.2693014912.

The spelling of 21086179 in words is "twenty-one million, eighty-six thousand, one hundred seventy-nine".