21267936 has 36 divisors (see below), whose sum is σ = 60481512. Its totient is φ = 7089216.

The previous prime is 21267919. The next prime is 21267941. The reversal of 21267936 is 63976212.

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 a self number, because there is not a number n which added to its sum of digits gives 21267936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36636 + ... + 37211.

It is an arithmetic number, because the mean of its divisors is an integer number (1680042).

Almost surely, 2^21267936 is an apocalyptic number.

It is an amenable number.

21267936 is an abundant number, since it is smaller than the sum of its proper divisors (39213576).

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

21267936 is a wasteful number, since it uses less digits than its factorization.

21267936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73863 (or 73852 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 21267936 is about 4611.7172506562. The cubic root of 21267936 is about 277.0608197938.

The spelling of 21267936 in words is "twenty-one million, two hundred sixty-seven thousand, nine hundred thirty-six".