21984673 has 16 divisors (see below), whose sum is σ = 23592960. Its totient is φ = 20451600.

The previous prime is 21984661. The next prime is 21984679. The reversal of 21984673 is 37648912.

It is a cyclic number.

It is not a de Polignac number, because 21984673 - 2⁹ = 21984161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21984679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115008 + ... + 115198.

It is an arithmetic number, because the mean of its divisors is an integer number (1474560).

Almost surely, 2^21984673 is an apocalyptic number.

It is an amenable number.

21984673 is a deficient number, since it is larger than the sum of its proper divisors (1608287).

21984673 is a wasteful number, since it uses less digits than its factorization.

21984673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 72576, while the sum is 40.

The square root of 21984673 is about 4688.7816114637. The cubic root of 21984673 is about 280.1388469532.

The spelling of 21984673 in words is "twenty-one million, nine hundred eighty-four thousand, six hundred seventy-three".