21738338 has 8 divisors (see below), whose sum is σ = 32845932. Its totient is φ = 10789696.

The previous prime is 21738329. The next prime is 21738361. The reversal of 21738338 is 83383712.

It can be written as a sum of positive squares in 2 ways, for example, as 21003889 + 734449 = 4583^2 + 857^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21738298 and 21738307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39395 + ... + 39942.

Almost surely, 2^21738338 is an apocalyptic number.

21738338 is a deficient number, since it is larger than the sum of its proper divisors (11107594).

21738338 is a wasteful number, since it uses less digits than its factorization.

21738338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79476.

The product of its digits is 24192, while the sum is 35.

The square root of 21738338 is about 4662.4390612640. The cubic root of 21738338 is about 279.0886098047.

The spelling of 21738338 in words is "twenty-one million, seven hundred thirty-eight thousand, three hundred thirty-eight".