21067159 has 2 divisors, whose sum is σ = 21067160. Its totient is φ = 21067158.

The previous prime is 21067127. The next prime is 21067177. The reversal of 21067159 is 95176012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21067159 - 2⁵ = 21067127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21067159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21062159) 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, 10533579 + 10533580.

It is an arithmetic number, because the mean of its divisors is an integer number (10533580).

Almost surely, 2^21067159 is an apocalyptic number.

21067159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21067159 is an equidigital number, since it uses as much as digits as its factorization.

21067159 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 21067159 is about 4589.8974934088. The cubic root of 21067159 is about 276.1862103691.

The spelling of 21067159 in words is "twenty-one million, sixty-seven thousand, one hundred fifty-nine".