21826746 has 48 divisors (see below), whose sum is σ = 49655424. Its totient is φ = 7185024.

The previous prime is 21826711. The next prime is 21826751. The reversal of 21826746 is 64762812.

It is a super-3 number, since 3×21826746³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21826746.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46911 + ... + 47373.

It is an arithmetic number, because the mean of its divisors is an integer number (1034488).

Almost surely, 2^21826746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21826746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24827712).

21826746 is an abundant number, since it is smaller than the sum of its proper divisors (27828678).

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

21826746 is an equidigital number, since it uses as much as digits as its factorization.

21826746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 565 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 21826746 is about 4671.9103159200. The cubic root of 21826746 is about 279.4664413974.

The spelling of 21826746 in words is "twenty-one million, eight hundred twenty-six thousand, seven hundred forty-six".