21168338 has 8 divisors (see below), whose sum is σ = 31785420. Its totient is φ = 10573200.

The previous prime is 21168331. The next prime is 21168373. The reversal of 21168338 is 83386112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19598329 + 1570009 = 4427^2 + 1253^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21168331) 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, 2813 + ... + 7088.

Almost surely, 2^21168338 is an apocalyptic number.

21168338 is a deficient number, since it is larger than the sum of its proper divisors (10617082).

21168338 is a wasteful number, since it uses less digits than its factorization.

21168338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972.

The product of its digits is 6912, while the sum is 32.

The square root of 21168338 is about 4600.9062150842. The cubic root of 21168338 is about 276.6276498583.

The spelling of 21168338 in words is "twenty-one million, one hundred sixty-eight thousand, three hundred thirty-eight".