21966297 has 8 divisors (see below), whose sum is σ = 29336256. Its totient is φ = 14620272.

The previous prime is 21966293. The next prime is 21966313. The reversal of 21966297 is 79266912.

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

It is not a de Polignac number, because 21966297 - 2² = 21966293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21966293) 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, 3718 + ... + 7599.

It is an arithmetic number, because the mean of its divisors is an integer number (3667032).

Almost surely, 2^21966297 is an apocalyptic number.

It is an amenable number.

21966297 is a deficient number, since it is larger than the sum of its proper divisors (7369959).

21966297 is a wasteful number, since it uses less digits than its factorization.

21966297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11967.

The product of its digits is 81648, while the sum is 42.

The square root of 21966297 is about 4686.8216309136. The cubic root of 21966297 is about 280.0607733729.

The spelling of 21966297 in words is "twenty-one million, nine hundred sixty-six thousand, two hundred ninety-seven".