21774336 has 60 divisors (see below), whose sum is σ = 58194192. Its totient is φ = 7241728.

The previous prime is 21774329. The next prime is 21774341. The reversal of 21774336 is 63347712.

It is a junction number, because it is equal to n+sod(n) for n = 21774297 and 21774306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48931 + ... + 49373.

Almost surely, 2^21774336 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 21774336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29097096).

21774336 is an abundant number, since it is smaller than the sum of its proper divisors (36419856).

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

21774336 is an frugal number, since it uses more digits than its factorization.

21774336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 448 counting only the distinct ones).

The product of its digits is 21168, while the sum is 33.

The square root of 21774336 is about 4666.2978901909. The cubic root of 21774336 is about 279.2425788162.

The spelling of 21774336 in words is "twenty-one million, seven hundred seventy-four thousand, three hundred thirty-six".