21650443 has 8 divisors (see below), whose sum is σ = 23576400. Its totient is φ = 19803168.

The previous prime is 21650437. The next prime is 21650449. The reversal of 21650443 is 34405612.

It is an interprime number because it is at equal distance from previous prime (21650437) and next prime (21650449).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21650443 - 2⁵ = 21650411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21650449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19096 + ... + 20197.

It is an arithmetic number, because the mean of its divisors is an integer number (2947050).

Almost surely, 2^21650443 is an apocalyptic number.

21650443 is a deficient number, since it is larger than the sum of its proper divisors (1925957).

21650443 is a wasteful number, since it uses less digits than its factorization.

21650443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39341.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21650443 is about 4653.0036535554. The cubic root of 21650443 is about 278.7119537582.

The spelling of 21650443 in words is "twenty-one million, six hundred fifty thousand, four hundred forty-three".