21261112 has 16 divisors (see below), whose sum is σ = 40370400. Its totient is φ = 10495680.

The previous prime is 21261103. The next prime is 21261113. The reversal of 21261112 is 21116212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261113) 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, 16189 + ... + 17452.

It is an arithmetic number, because the mean of its divisors is an integer number (2523150).

Almost surely, 2^21261112 is an apocalyptic number.

It is an amenable number.

21261112 is a deficient number, since it is larger than the sum of its proper divisors (19109288).

21261112 is a wasteful number, since it uses less digits than its factorization.

21261112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33726 (or 33722 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 21261112 is about 4610.9773367476. The cubic root of 21261112 is about 277.0311841757.

Adding to 21261112 its reverse (21116212), we get a palindrome (42377324).

The spelling of 21261112 in words is "twenty-one million, two hundred sixty-one thousand, one hundred twelve".