21916056 has 32 divisors (see below), whose sum is σ = 57173760. Its totient is φ = 6987552.

The previous prime is 21916051. The next prime is 21916057. The reversal of 21916056 is 65061912.

It is a super-3 number, since 3×21916056³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21916051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19300 + ... + 20403.

It is an arithmetic number, because the mean of its divisors is an integer number (1786680).

Almost surely, 2^21916056 is an apocalyptic number.

It is an amenable number.

21916056 is an abundant number, since it is smaller than the sum of its proper divisors (35257704).

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

21916056 is a wasteful number, since it uses less digits than its factorization.

21916056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39735 (or 39731 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21916056 is about 4681.4587470147. The cubic root of 21916056 is about 279.8470933844.

Adding to 21916056 its reverse (65061912), we get a palindrome (86977968).

The spelling of 21916056 in words is "twenty-one million, nine hundred sixteen thousand, fifty-six".