21723642983 has 4 divisors (see below), whose sum is σ = 24827020560. Its totient is φ = 18620265408.

The previous prime is 21723642979. The next prime is 21723643003. The reversal of 21723642983 is 38924632712.

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 21723642983 - 2² = 21723642979 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 (21723642923) 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 3 ways as a sum of consecutive naturals, for example, 1551688778 + ... + 1551688791.

It is an arithmetic number, because the mean of its divisors is an integer number (6206755140).

Almost surely, 2^21723642983 is an apocalyptic number.

21723642983 is a deficient number, since it is larger than the sum of its proper divisors (3103377577).

21723642983 is an equidigital number, since it uses as much as digits as its factorization.

21723642983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103377576.

The product of its digits is 870912, while the sum is 47.

The spelling of 21723642983 in words is "twenty-one billion, seven hundred twenty-three million, six hundred forty-two thousand, nine hundred eighty-three".