21091112 has 16 divisors (see below), whose sum is σ = 45195360. Its totient is φ = 9039024.

The previous prime is 21091079. The next prime is 21091139. The reversal of 21091112 is 21119012.

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, 188258 + ... + 188369.

It is an arithmetic number, because the mean of its divisors is an integer number (2824710).

Almost surely, 2^21091112 is an apocalyptic number.

It is an amenable number.

21091112 is an abundant number, since it is smaller than the sum of its proper divisors (24104248).

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

21091112 is a wasteful number, since it uses less digits than its factorization.

21091112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376640 (or 376636 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21091112 is about 4592.5060696748. The cubic root of 21091112 is about 276.2908437251.

The spelling of 21091112 in words is "twenty-one million, ninety-one thousand, one hundred twelve".