21448338 has 16 divisors (see below), whose sum is σ = 43079040. Its totient is φ = 7119056.

The previous prime is 21448337. The next prime is 21448379. The reversal of 21448338 is 83384412.

It is a junction number, because it is equal to n+sod(n) for n = 21448299 and 21448308.

It is not an unprimeable number, because it can be changed into a prime (21448331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6045 + ... + 8912.

It is an arithmetic number, because the mean of its divisors is an integer number (2692440).

Almost surely, 2^21448338 is an apocalyptic number.

21448338 is an abundant number, since it is smaller than the sum of its proper divisors (21630702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21448338 is a wasteful number, since it uses less digits than its factorization.

21448338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15201.

The product of its digits is 18432, while the sum is 33.

The square root of 21448338 is about 4631.2350404617. The cubic root of 21448338 is about 277.8419905003.

The spelling of 21448338 in words is "twenty-one million, four hundred forty-eight thousand, three hundred thirty-eight".