21234158 has 8 divisors (see below), whose sum is σ = 34746840. Its totient is φ = 9651880.

The previous prime is 21234151. The next prime is 21234203. The reversal of 21234158 is 85143212.

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 (21234151) 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, 482573 + ... + 482616.

It is an arithmetic number, because the mean of its divisors is an integer number (4343355).

Almost surely, 2^21234158 is an apocalyptic number.

21234158 is a deficient number, since it is larger than the sum of its proper divisors (13512682).

21234158 is a wasteful number, since it uses less digits than its factorization.

21234158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965202.

The product of its digits is 1920, while the sum is 26.

The square root of 21234158 is about 4608.0536021188. The cubic root of 21234158 is about 276.9140649291.

The spelling of 21234158 in words is "twenty-one million, two hundred thirty-four thousand, one hundred fifty-eight".