21994112 has 32 divisors (see below), whose sum is σ = 50077920. Its totient is φ = 9425664.

The previous prime is 21994111. The next prime is 21994123. The reversal of 21994112 is 21149912.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21994111) 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 3 ways as a sum of consecutive naturals, for example, 11378 + ... + 13169.

It is an arithmetic number, because the mean of its divisors is an integer number (1564935).

Almost surely, 2^21994112 is an apocalyptic number.

It is an amenable number.

21994112 is an abundant number, since it is smaller than the sum of its proper divisors (28083808).

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

21994112 is an equidigital number, since it uses as much as digits as its factorization.

21994112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24568 (or 24556 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 21994112 is about 4689.7880549125. The cubic root of 21994112 is about 280.1789332479.

The spelling of 21994112 in words is "twenty-one million, nine hundred ninety-four thousand, one hundred twelve".