21790112 has 24 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 10321344.

The previous prime is 21790099. The next prime is 21790123. The reversal of 21790112 is 21109712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17312 + ... + 18527.

It is an arithmetic number, because the mean of its divisors is an integer number (1881600).

Almost surely, 2^21790112 is an apocalyptic number.

It is an amenable number.

21790112 is an abundant number, since it is smaller than the sum of its proper divisors (23368288).

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

21790112 is a wasteful number, since it uses less digits than its factorization.

21790112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35868 (or 35860 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 21790112 is about 4667.9880034122. The cubic root of 21790112 is about 279.3100017284.

Adding to 21790112 its reverse (21109712), we get a palindrome (42899824).

The spelling of 21790112 in words is "twenty-one million, seven hundred ninety thousand, one hundred twelve".