21966267 has 8 divisors (see below), whose sum is σ = 29335824. Its totient is φ = 14620448.

The previous prime is 21966257. The next prime is 21966281. The reversal of 21966267 is 76266912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21966267 - 2¹⁰ = 21965243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21966257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3648 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (3666978).

Almost surely, 2^21966267 is an apocalyptic number.

21966267 is a deficient number, since it is larger than the sum of its proper divisors (7369557).

21966267 is a wasteful number, since it uses less digits than its factorization.

21966267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11869.

The product of its digits is 54432, while the sum is 39.

The square root of 21966267 is about 4686.8184304494. The cubic root of 21966267 is about 280.0606458772.

The spelling of 21966267 in words is "twenty-one million, nine hundred sixty-six thousand, two hundred sixty-seven".