19380994721 has 16 divisors (see below), whose sum is σ = 22458653568. Its totient is φ = 16529299200.

The previous prime is 19380994673. The next prime is 19380994723. The reversal of 19380994721 is 12749908391.

It is a cyclic number.

It is not a de Polignac number, because 19380994721 - 2³⁰ = 18307252897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19380994723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108470 + ... + 224783.

It is an arithmetic number, because the mean of its divisors is an integer number (1403665848).

Almost surely, 2^19380994721 is an apocalyptic number.

19380994721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19380994721 is a deficient number, since it is larger than the sum of its proper divisors (3077658847).

19380994721 is a wasteful number, since it uses less digits than its factorization.

19380994721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333592.

The product of its (nonzero) digits is 979776, while the sum is 53.

It can be divided in two parts, 19380 and 994721, that added together give a palindrome (1014101).

The spelling of 19380994721 in words is "nineteen billion, three hundred eighty million, nine hundred ninety-four thousand, seven hundred twenty-one".