21169238 has 8 divisors (see below), whose sum is σ = 31790232. Its totient is φ = 10572496.

The previous prime is 21169229. The next prime is 21169241. The reversal of 21169238 is 83296112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3695 + ... + 7482.

It is an arithmetic number, because the mean of its divisors is an integer number (3973779).

Almost surely, 2^21169238 is an apocalyptic number.

21169238 is a deficient number, since it is larger than the sum of its proper divisors (10620994).

21169238 is a wasteful number, since it uses less digits than its factorization.

21169238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12126.

The product of its digits is 5184, while the sum is 32.

The square root of 21169238 is about 4601.0040208633. The cubic root of 21169238 is about 276.6315702001.

The spelling of 21169238 in words is "twenty-one million, one hundred sixty-nine thousand, two hundred thirty-eight".