21723408983 has 4 divisors (see below), whose sum is σ = 21967492320. Its totient is φ = 21479325648.

The previous prime is 21723408907. The next prime is 21723409003. The reversal of 21723408983 is 38980432712.

It is a happy number.

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 21723408983 - 2¹⁴ = 21723392599 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 (21723408383) 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, 122041535 + ... + 122041712.

It is an arithmetic number, because the mean of its divisors is an integer number (5491873080).

Almost surely, 2^21723408983 is an apocalyptic number.

21723408983 is a deficient number, since it is larger than the sum of its proper divisors (244083337).

21723408983 is an equidigital number, since it uses as much as digits as its factorization.

21723408983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244083336.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 21723408983 in words is "twenty-one billion, seven hundred twenty-three million, four hundred eight thousand, nine hundred eighty-three".