21938112 has 84 divisors (see below), whose sum is σ = 71877936. Its totient is φ = 6266880.

The previous prime is 21938099. The next prime is 21938129. The reversal of 21938112 is 21183912.

It is a tau number, because it is divible by the number of its divisors (84).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1312 + ... + 6752.

Almost surely, 2^21938112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21938112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35938968).

21938112 is an abundant number, since it is smaller than the sum of its proper divisors (49939824).

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

21938112 is a wasteful number, since it uses less digits than its factorization.

21938112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466 (or 5453 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 21938112 is about 4683.8138306299. The cubic root of 21938112 is about 279.9409399244.

The spelling of 21938112 in words is "twenty-one million, nine hundred thirty-eight thousand, one hundred twelve".