21276885 has 16 divisors (see below), whose sum is σ = 38906496. Its totient is φ = 9726528.

The previous prime is 21276859. The next prime is 21276907. The reversal of 21276885 is 58867212.

It is not a de Polignac number, because 21276885 - 2⁶ = 21276821 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 15 ways as a sum of consecutive naturals, for example, 101214 + ... + 101423.

It is an arithmetic number, because the mean of its divisors is an integer number (2431656).

Almost surely, 2^21276885 is an apocalyptic number.

It is an amenable number.

21276885 is a deficient number, since it is larger than the sum of its proper divisors (17629611).

21276885 is a wasteful number, since it uses less digits than its factorization.

21276885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202652.

The product of its digits is 53760, while the sum is 39.

The square root of 21276885 is about 4612.6873945673. The cubic root of 21276885 is about 277.0996743649.

The spelling of 21276885 in words is "twenty-one million, two hundred seventy-six thousand, eight hundred eighty-five".