21783484923 has 8 divisors (see below), whose sum is σ = 29048943168. Its totient is φ = 14520174984.

The previous prime is 21783484913. The next prime is 21783484927. The reversal of 21783484923 is 32948438712.

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

It is not a de Polignac number, because 21783484923 - 2⁴ = 21783484907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21783484927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513265 + ... + 554082.

It is an arithmetic number, because the mean of its divisors is an integer number (3631117896).

Almost surely, 2^21783484923 is an apocalyptic number.

21783484923 is a deficient number, since it is larger than the sum of its proper divisors (7265458245).

21783484923 is a wasteful number, since it uses less digits than its factorization.

21783484923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074153.

The product of its digits is 2322432, while the sum is 51.

The spelling of 21783484923 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred twenty-three".