21783218383 has 4 divisors (see below), whose sum is σ = 21864197160. Its totient is φ = 21702239608.

The previous prime is 21783218351. The next prime is 21783218459. The reversal of 21783218383 is 38381238712.

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 21783218383 - 2⁵ = 21783218351 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 (21783218183) 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, 40488985 + ... + 40489522.

It is an arithmetic number, because the mean of its divisors is an integer number (5466049290).

Almost surely, 2^21783218383 is an apocalyptic number.

21783218383 is a deficient number, since it is larger than the sum of its proper divisors (80978777).

21783218383 is an equidigital number, since it uses as much as digits as its factorization.

21783218383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80978776.

The product of its digits is 387072, while the sum is 46.

The spelling of 21783218383 in words is "twenty-one billion, seven hundred eighty-three million, two hundred eighteen thousand, three hundred eighty-three".