21299158 has 8 divisors (see below), whose sum is σ = 32024160. Its totient is φ = 10624440.

The previous prime is 21299153. The next prime is 21299167. The reversal of 21299158 is 85199212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11493 + ... + 13216.

It is an arithmetic number, because the mean of its divisors is an integer number (4003020).

Almost surely, 2^21299158 is an apocalyptic number.

21299158 is a deficient number, since it is larger than the sum of its proper divisors (10725002).

21299158 is a wasteful number, since it uses less digits than its factorization.

21299158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25142.

The product of its digits is 12960, while the sum is 37.

The square root of 21299158 is about 4615.1010823166. The cubic root of 21299158 is about 277.1963315072.

The spelling of 21299158 in words is "twenty-one million, two hundred ninety-nine thousand, one hundred fifty-eight".