21290159 has 8 divisors (see below), whose sum is σ = 23607120. Its totient is φ = 19036800.

The previous prime is 21290141. The next prime is 21290161. The reversal of 21290159 is 95109212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21290159 - 2²⁰ = 20241583 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 (21290119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15194 + ... + 16535.

It is an arithmetic number, because the mean of its divisors is an integer number (2950890).

Almost surely, 2^21290159 is an apocalyptic number.

21290159 is a deficient number, since it is larger than the sum of its proper divisors (2316961).

21290159 is a wasteful number, since it uses less digits than its factorization.

21290159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31801.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 21290159 is about 4614.1260277543. The cubic root of 21290159 is about 277.1572870658.

The spelling of 21290159 in words is "twenty-one million, two hundred ninety thousand, one hundred fifty-nine".