21763056 has 120 divisors (see below), whose sum is σ = 68983680. Its totient is φ = 5878656.

The previous prime is 21763039. The next prime is 21763061. The reversal of 21763056 is 65036712.

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, 44445 + ... + 44931.

It is an arithmetic number, because the mean of its divisors is an integer number (574864).

Almost surely, 2^21763056 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 21763056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34491840).

21763056 is an abundant number, since it is smaller than the sum of its proper divisors (47220624).

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

21763056 is a wasteful number, since it uses less digits than its factorization.

21763056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 21763056 is about 4665.0890666739. The cubic root of 21763056 is about 279.1943507805.

Adding to 21763056 its reverse (65036712), we get a palindrome (86799768).

The spelling of 21763056 in words is "twenty-one million, seven hundred sixty-three thousand, fifty-six".