21267324 has 72 divisors (see below), whose sum is σ = 59928960. Its totient is φ = 6314112.

The previous prime is 21267263. The next prime is 21267371. The reversal of 21267324 is 42376212.

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, 12789 + ... + 14355.

Almost surely, 2^21267324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21267324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29964480).

21267324 is an abundant number, since it is smaller than the sum of its proper divisors (38661636).

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

21267324 is a wasteful number, since it uses less digits than its factorization.

21267324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 1614 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21267324 is about 4611.6508974553. The cubic root of 21267324 is about 277.0581622275.

The spelling of 21267324 in words is "twenty-one million, two hundred sixty-seven thousand, three hundred twenty-four".