21911159 has 2 divisors, whose sum is σ = 21911160. Its totient is φ = 21911158.

The previous prime is 21911143. The next prime is 21911167. The reversal of 21911159 is 95111912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21911159 - 2⁴ = 21911143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21911119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955579 + 10955580.

It is an arithmetic number, because the mean of its divisors is an integer number (10955580).

Almost surely, 2^21911159 is an apocalyptic number.

21911159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21911159 is an equidigital number, since it uses as much as digits as its factorization.

21911159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 29.

The square root of 21911159 is about 4680.9356970589. The cubic root of 21911159 is about 279.8262484949.

The spelling of 21911159 in words is "twenty-one million, nine hundred eleven thousand, one hundred fifty-nine".