21438348 has 24 divisors (see below), whose sum is σ = 50710128. Its totient is φ = 7047936.

The previous prime is 21438331. The next prime is 21438349. The reversal of 21438348 is 84383412.

It is not an unprimeable number, because it can be changed into a prime (21438349) 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 7 ways as a sum of consecutive naturals, for example, 11361 + ... + 13112.

It is an arithmetic number, because the mean of its divisors is an integer number (2112922).

Almost surely, 2^21438348 is an apocalyptic number.

It is an amenable number.

21438348 is an abundant number, since it is smaller than the sum of its proper divisors (29271780).

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

21438348 is a wasteful number, since it uses less digits than its factorization.

21438348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24553 (or 24551 counting only the distinct ones).

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

The square root of 21438348 is about 4630.1563688498. The cubic root of 21438348 is about 277.7988469471.

The spelling of 21438348 in words is "twenty-one million, four hundred thirty-eight thousand, three hundred forty-eight".