21444983 has 4 divisors (see below), whose sum is σ = 24508560. Its totient is φ = 18381408.

The previous prime is 21444979. The next prime is 21445013. The reversal of 21444983 is 38944412.

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

It is a cyclic number.

It is not a de Polignac number, because 21444983 - 2² = 21444979 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 (21444923) 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, 1531778 + ... + 1531791.

It is an arithmetic number, because the mean of its divisors is an integer number (6127140).

Almost surely, 2^21444983 is an apocalyptic number.

21444983 is a deficient number, since it is larger than the sum of its proper divisors (3063577).

21444983 is an equidigital number, since it uses as much as digits as its factorization.

21444983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063576.

The product of its digits is 27648, while the sum is 35.

The square root of 21444983 is about 4630.8728119006. The cubic root of 21444983 is about 277.8275028434.

The spelling of 21444983 in words is "twenty-one million, four hundred forty-four thousand, nine hundred eighty-three".