21214159 has 2 divisors, whose sum is σ = 21214160. Its totient is φ = 21214158.

The previous prime is 21214139. The next prime is 21214163. The reversal of 21214159 is 95141212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21214159 - 2¹¹ = 21212111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607079 + 10607080.

It is an arithmetic number, because the mean of its divisors is an integer number (10607080).

Almost surely, 2^21214159 is an apocalyptic number.

21214159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214159 is an equidigital number, since it uses as much as digits as its factorization.

21214159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 21214159 is about 4605.8830857936. The cubic root of 21214159 is about 276.8271021540.

The spelling of 21214159 in words is "twenty-one million, two hundred fourteen thousand, one hundred fifty-nine".