21358159 has 2 divisors, whose sum is σ = 21358160. Its totient is φ = 21358158.

The previous prime is 21358153. The next prime is 21358187. The reversal of 21358159 is 95185312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21358159 - 2⁷ = 21358031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21358153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10679079 + 10679080.

It is an arithmetic number, because the mean of its divisors is an integer number (10679080).

Almost surely, 2^21358159 is an apocalyptic number.

21358159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21358159 is an equidigital number, since it uses as much as digits as its factorization.

21358159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 21358159 is about 4621.4888293709. The cubic root of 21358159 is about 277.4520502602.

The spelling of 21358159 in words is "twenty-one million, three hundred fifty-eight thousand, one hundred fifty-nine".