21966072 has 16 divisors (see below), whose sum is σ = 54915240. Its totient is φ = 7322016.

The previous prime is 21966067. The next prime is 21966097. The reversal of 21966072 is 27066912.

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, 457603 + ... + 457650.

Almost surely, 2^21966072 is an apocalyptic number.

It is an amenable number.

21966072 is an abundant number, since it is smaller than the sum of its proper divisors (32949168).

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

21966072 is a wasteful number, since it uses less digits than its factorization.

21966072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915262 (or 915258 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21966072 is about 4686.7976273784. The cubic root of 21966072 is about 280.0598171522.

The spelling of 21966072 in words is "twenty-one million, nine hundred sixty-six thousand, seventy-two".