21027159 has 12 divisors (see below), whose sum is σ = 30464616. Its totient is φ = 13975632.

The previous prime is 21027143. The next prime is 21027169. The reversal of 21027159 is 95172012.

It is not a de Polignac number, because 21027159 - 2⁴ = 21027143 is a prime.

It is a super-2 number, since 2×21027159² = 884282831222562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (2538718).

Almost surely, 2^21027159 is an apocalyptic number.

21027159 is a deficient number, since it is larger than the sum of its proper divisors (9437457).

21027159 is a wasteful number, since it uses less digits than its factorization.

21027159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7086 (or 7083 counting only the distinct ones).

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

The square root of 21027159 is about 4585.5380273202. The cubic root of 21027159 is about 276.0113023097.

It can be divided in two parts, 2102 and 7159, that added together give a cube (9261 = 21³).

The spelling of 21027159 in words is "twenty-one million, twenty-seven thousand, one hundred fifty-nine".