21112895 has 24 divisors (see below), whose sum is σ = 28366800. Its totient is φ = 15040512.

The previous prime is 21112879. The next prime is 21112907. The reversal of 21112895 is 59821112.

It is not a de Polignac number, because 21112895 - 2⁴ = 21112879 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 27071 + ... + 27839.

It is an arithmetic number, because the mean of its divisors is an integer number (1181950).

Almost surely, 2^21112895 is an apocalyptic number.

21112895 is a deficient number, since it is larger than the sum of its proper divisors (7253905).

21112895 is a wasteful number, since it uses less digits than its factorization.

21112895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 810 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 21112895 is about 4594.8770386159. The cubic root of 21112895 is about 276.3859291601.

The spelling of 21112895 in words is "twenty-one million, one hundred twelve thousand, eight hundred ninety-five".