21488338 has 8 divisors (see below), whose sum is σ = 32594940. Its totient is φ = 10623360.

The previous prime is 21488329. The next prime is 21488339. The reversal of 21488338 is 83388412.

It can be written as a sum of positive squares in 2 ways, for example, as 16184529 + 5303809 = 4023^2 + 2303^2 .

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 = 21488297 and 21488306.

It is not an unprimeable number, because it can be changed into a prime (21488339) by changing a digit.

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, 60183 + ... + 60538.

Almost surely, 2^21488338 is an apocalyptic number.

21488338 is a deficient number, since it is larger than the sum of its proper divisors (11106602).

21488338 is a wasteful number, since it uses less digits than its factorization.

21488338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120812.

The product of its digits is 36864, while the sum is 37.

The square root of 21488338 is about 4635.5515313714. The cubic root of 21488338 is about 278.0146033769.

The spelling of 21488338 in words is "twenty-one million, four hundred eighty-eight thousand, three hundred thirty-eight".