19721119983 has 8 divisors (see below), whose sum is σ = 26389754928. Its totient is φ = 13099949184.

The previous prime is 19721119981. The next prime is 19721120021. The reversal of 19721119983 is 38991112791.

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

It is not a de Polignac number, because 19721119983 - 2¹ = 19721119981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19721119981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11865066 + ... + 11866727.

It is an arithmetic number, because the mean of its divisors is an integer number (3298719366).

Almost surely, 2^19721119983 is an apocalyptic number.

19721119983 is a deficient number, since it is larger than the sum of its proper divisors (6668634945).

19721119983 is a wasteful number, since it uses less digits than its factorization.

19721119983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23732073.

The product of its digits is 244944, while the sum is 51.

The spelling of 19721119983 in words is "nineteen billion, seven hundred twenty-one million, one hundred nineteen thousand, nine hundred eighty-three".