21910159 has 2 divisors, whose sum is σ = 21910160. Its totient is φ = 21910158.

The previous prime is 21910157. The next prime is 21910169. The reversal of 21910159 is 95101912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21910159 - 2¹ = 21910157 is a prime.

Together with 21910157, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21910157) 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, 10955079 + 10955080.

It is an arithmetic number, because the mean of its divisors is an integer number (10955080).

Almost surely, 2^21910159 is an apocalyptic number.

21910159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21910159 is an equidigital number, since it uses as much as digits as its factorization.

21910159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 21910159 is about 4680.8288795896. The cubic root of 21910159 is about 279.8219914478.

The spelling of 21910159 in words is "twenty-one million, nine hundred ten thousand, one hundred fifty-nine".