21984373 has 4 divisors (see below), whose sum is σ = 21998668. Its totient is φ = 21970080.

The previous prime is 21984359. The next prime is 21984397. The reversal of 21984373 is 37348912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8720209 + 13264164 = 2953^2 + 3642^2 .

It is a cyclic number.

It is not a de Polignac number, because 21984373 - 2⁹ = 21983861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21984353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4518 + ... + 8023.

It is an arithmetic number, because the mean of its divisors is an integer number (5499667).

Almost surely, 2^21984373 is an apocalyptic number.

It is an amenable number.

21984373 is a deficient number, since it is larger than the sum of its proper divisors (14295).

21984373 is a wasteful number, since it uses less digits than its factorization.

21984373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14294.

The product of its digits is 36288, while the sum is 37.

The square root of 21984373 is about 4688.7496201013. The cubic root of 21984373 is about 280.1375727013.

The spelling of 21984373 in words is "twenty-one million, nine hundred eighty-four thousand, three hundred seventy-three".