21112886 has 4 divisors (see below), whose sum is σ = 31669332. Its totient is φ = 10556442.

The previous prime is 21112879. The next prime is 21112907. The reversal of 21112886 is 68821112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278220 + ... + 5278223.

It is an arithmetic number, because the mean of its divisors is an integer number (7917333).

Almost surely, 2^21112886 is an apocalyptic number.

21112886 is a deficient number, since it is larger than the sum of its proper divisors (10556446).

21112886 is a wasteful number, since it uses less digits than its factorization.

21112886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10556445.

The product of its digits is 1536, while the sum is 29.

The square root of 21112886 is about 4594.8760592643. The cubic root of 21112886 is about 276.3858898876.

Adding to 21112886 its reverse (68821112), we get a palindrome (89933998).

The spelling of 21112886 in words is "twenty-one million, one hundred twelve thousand, eight hundred eighty-six".