21966416 has 20 divisors (see below), whose sum is σ = 42780000. Its totient is φ = 10926432.

The previous prime is 21966401. The next prime is 21966463. The reversal of 21966416 is 61466912.

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, 266 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (2139000).

Almost surely, 2^21966416 is an apocalyptic number.

It is an amenable number.

21966416 is a deficient number, since it is larger than the sum of its proper divisors (20813584).

21966416 is a wasteful number, since it uses less digits than its factorization.

21966416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106 (or 7100 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 21966416 is about 4686.8343260670. The cubic root of 21966416 is about 280.0612791049.

The spelling of 21966416 in words is "twenty-one million, nine hundred sixty-six thousand, four hundred sixteen".