21446616 has 16 divisors (see below), whose sum is σ = 53616600. Its totient is φ = 7148864.

The previous prime is 21446599. The next prime is 21446627. The reversal of 21446616 is 61664412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446781 + ... + 446828.

Almost surely, 2^21446616 is an apocalyptic number.

It is an amenable number.

21446616 is an abundant number, since it is smaller than the sum of its proper divisors (32169984).

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

21446616 is a wasteful number, since it uses less digits than its factorization.

21446616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893618 (or 893614 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 21446616 is about 4631.0491251983. The cubic root of 21446616 is about 277.8345546994.

The spelling of 21446616 in words is "twenty-one million, four hundred forty-six thousand, six hundred sixteen".