21836268 has 36 divisors (see below), whose sum is σ = 55495440. Its totient is φ = 7239456.

The previous prime is 21836251. The next prime is 21836273. The reversal of 21836268 is 86263812.

21836268 is a `hidden beast` number, since 21 + 8 + 3 + 626 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5553 + ... + 8631.

It is an arithmetic number, because the mean of its divisors is an integer number (1541540).

Almost surely, 2^21836268 is an apocalyptic number.

It is an amenable number.

21836268 is an abundant number, since it is smaller than the sum of its proper divisors (33659172).

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

21836268 is a wasteful number, since it uses less digits than its factorization.

21836268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286 (or 3281 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21836268 is about 4672.9292740207. The cubic root of 21836268 is about 279.5070749177.

The spelling of 21836268 in words is "twenty-one million, eight hundred thirty-six thousand, two hundred sixty-eight".