21416056 has 48 divisors (see below), whose sum is σ = 43655400. Its totient is φ = 9844224.

The previous prime is 21416053. The next prime is 21416089. The reversal of 21416056 is 65061412.

It is a self number, because there is not a number n which added to its sum of digits gives 21416056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416051) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 136330 + ... + 136486.

Almost surely, 2^21416056 is an apocalyptic number.

It is an amenable number.

21416056 is an abundant number, since it is smaller than the sum of its proper divisors (22239344).

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

21416056 is a wasteful number, since it uses less digits than its factorization.

21416056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21416056 is about 4627.7484806329. The cubic root of 21416056 is about 277.7025267212.

Adding to 21416056 its reverse (65061412), we get a palindrome (86477468).

The spelling of 21416056 in words is "twenty-one million, four hundred sixteen thousand, fifty-six".