21966068 has 12 divisors (see below), whose sum is σ = 38475780. Its totient is φ = 10972992.

The previous prime is 21966067. The next prime is 21966097. The reversal of 21966068 is 86066912.

It can be written as a sum of positive squares in 2 ways, for example, as 21141604 + 824464 = 4598^2 + 908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21966067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4730 + ... + 8142.

It is an arithmetic number, because the mean of its divisors is an integer number (3206315).

Almost surely, 2^21966068 is an apocalyptic number.

It is an amenable number.

21966068 is a deficient number, since it is larger than the sum of its proper divisors (16509712).

21966068 is a wasteful number, since it uses less digits than its factorization.

21966068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026 (or 5024 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 21966068 is about 4686.7972006478. The cubic root of 21966068 is about 280.0598001526.

The spelling of 21966068 in words is "twenty-one million, nine hundred sixty-six thousand, sixty-eight".