21938448 has 40 divisors (see below), whose sum is σ = 64771648. Its totient is φ = 6268032.

The previous prime is 21938437. The next prime is 21938453. The reversal of 21938448 is 84483912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32311 + ... + 32982.

Almost surely, 2^21938448 is an apocalyptic number.

21938448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21938448 is an abundant number, since it is smaller than the sum of its proper divisors (42833200).

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

21938448 is a wasteful number, since it uses less digits than its factorization.

21938448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65311 (or 65305 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 21938448 is about 4683.8496986987. The cubic root of 21938448 is about 279.9423690913.

The spelling of 21938448 in words is "twenty-one million, nine hundred thirty-eight thousand, four hundred forty-eight".