21919112 has 16 divisors (see below), whose sum is σ = 41193360. Its totient is φ = 10934224.

The previous prime is 21919111. The next prime is 21919123. The reversal of 21919112 is 21191912.

It is not an unprimeable number, because it can be changed into a prime (21919111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 803 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (2574585).

Almost surely, 2^21919112 is an apocalyptic number.

It is an amenable number.

21919112 is a deficient number, since it is larger than the sum of its proper divisors (19274248).

21919112 is a wasteful number, since it uses less digits than its factorization.

21919112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340 (or 6336 counting only the distinct ones).

The product of its digits is 324, while the sum is 26.

The square root of 21919112 is about 4681.7851296274. The cubic root of 21919112 is about 279.8601001798.

The spelling of 21919112 in words is "twenty-one million, nine hundred nineteen thousand, one hundred twelve".