21446016 has 32 divisors (see below), whose sum is σ = 56967000. Its totient is φ = 7148544.

The previous prime is 21445981. The next prime is 21446039. The reversal of 21446016 is 61064412.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 3 ways as a sum of consecutive naturals, for example, 27541 + ... + 28308.

Almost surely, 2^21446016 is an apocalyptic number.

It is an amenable number.

21446016 is an abundant number, since it is smaller than the sum of its proper divisors (35520984).

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

21446016 is an equidigital number, since it uses as much as digits as its factorization.

21446016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55866 (or 55854 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21446016 is about 4630.9843446075. The cubic root of 21446016 is about 277.8319637345.

The spelling of 21446016 in words is "twenty-one million, four hundred forty-six thousand, sixteen".