21036159 has 16 divisors (see below), whose sum is σ = 31891200. Its totient is φ = 13697208.

The previous prime is 21036151. The next prime is 21036163. The reversal of 21036159 is 95163012.

It is not a de Polignac number, because 21036159 - 2³ = 21036151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7899 + ... + 10220.

It is an arithmetic number, because the mean of its divisors is an integer number (1993200).

Almost surely, 2^21036159 is an apocalyptic number.

21036159 is a deficient number, since it is larger than the sum of its proper divisors (10855041).

21036159 is a wasteful number, since it uses less digits than its factorization.

21036159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18171 (or 18165 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 21036159 is about 4586.5192684649. The cubic root of 21036159 is about 276.0506759501.

The spelling of 21036159 in words is "twenty-one million, thirty-six thousand, one hundred fifty-nine".