21983073 has 16 divisors (see below), whose sum is σ = 34654080. Its totient is φ = 12128256.

The previous prime is 21983047. The next prime is 21983077. The reversal of 21983073 is 37038912.

It is not a de Polignac number, because 21983073 - 2⁵ = 21983041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21983077) 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, 17440 + ... + 18657.

It is an arithmetic number, because the mean of its divisors is an integer number (2165880).

Almost surely, 2^21983073 is an apocalyptic number.

It is an amenable number.

21983073 is a deficient number, since it is larger than the sum of its proper divisors (12671007).

21983073 is a wasteful number, since it uses less digits than its factorization.

21983073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36136.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21983073 is about 4688.6109883419. The cubic root of 21983073 is about 280.1320508090.

The spelling of 21983073 in words is "twenty-one million, nine hundred eighty-three thousand, seventy-three".