21466973 has 24 divisors (see below), whose sum is σ = 25025280. Its totient is φ = 18374400.

The previous prime is 21466969. The next prime is 21466987. The reversal of 21466973 is 37966412.

It is not a de Polignac number, because 21466973 - 2² = 21466969 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221261 + ... + 221357.

It is an arithmetic number, because the mean of its divisors is an integer number (1042720).

Almost surely, 2^21466973 is an apocalyptic number.

It is an amenable number.

21466973 is a deficient number, since it is larger than the sum of its proper divisors (3558307).

21466973 is a wasteful number, since it uses less digits than its factorization.

21466973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 198 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 21466973 is about 4633.2464859966. The cubic root of 21466973 is about 277.9224332014.

It can be divided in two parts, 2146 and 6973, that added together give a palindrome (9119).

The spelling of 21466973 in words is "twenty-one million, four hundred sixty-six thousand, nine hundred seventy-three".