21826364 has 36 divisors (see below), whose sum is σ = 46778760. Its totient is φ = 8860320.

The previous prime is 21826361. The next prime is 21826367. The reversal of 21826364 is 46362812.

It is an interprime number because it is at equal distance from previous prime (21826361) and next prime (21826367).

It is a self number, because there is not a number n which added to its sum of digits gives 21826364.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 794 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (1299410).

Almost surely, 2^21826364 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 21826364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23389380).

21826364 is an abundant number, since it is smaller than the sum of its proper divisors (24952396).

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

21826364 is a wasteful number, since it uses less digits than its factorization.

21826364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898 (or 5889 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 21826364 is about 4671.8694331071. The cubic root of 21826364 is about 279.4648110307.

The spelling of 21826364 in words is "twenty-one million, eight hundred twenty-six thousand, three hundred sixty-four".