21207159 has 6 divisors (see below), whose sum is σ = 30632576. Its totient is φ = 14138100.

The previous prime is 21207133. The next prime is 21207161. The reversal of 21207159 is 95170212.

It is not a de Polignac number, because 21207159 - 2¹¹ = 21205111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21207259) 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 in 5 ways as a sum of consecutive naturals, for example, 1178167 + ... + 1178184.

Almost surely, 2^21207159 is an apocalyptic number.

21207159 is a deficient number, since it is larger than the sum of its proper divisors (9425417).

21207159 is a wasteful number, since it uses less digits than its factorization.

21207159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356357 (or 2356354 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 21207159 is about 4605.1231253898. The cubic root of 21207159 is about 276.7966507483.

The spelling of 21207159 in words is "twenty-one million, two hundred seven thousand, one hundred fifty-nine".