19721947103 has 8 divisors (see below), whose sum is σ = 20783182176. Its totient is φ = 18677692000.

The previous prime is 19721947067. The next prime is 19721947109. The reversal of 19721947103 is 30174912791.

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

It is a cyclic number.

It is not a de Polignac number, because 19721947103 - 2⁸ = 19721946847 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 (19721947109) 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, 4242608 + ... + 4247253.

It is an arithmetic number, because the mean of its divisors is an integer number (2597897772).

Almost surely, 2^19721947103 is an apocalyptic number.

19721947103 is a deficient number, since it is larger than the sum of its proper divisors (1061235073).

19721947103 is a wasteful number, since it uses less digits than its factorization.

19721947103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8489985.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 19721947103 in words is "nineteen billion, seven hundred twenty-one million, nine hundred forty-seven thousand, one hundred three".