19721760504 has 64 divisors (see below), whose sum is σ = 51638307840. Its totient is φ = 6264846720.

The previous prime is 19721760479. The next prime is 19721760529. The reversal of 19721760504 is 40506712791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19721760479) and next prime (19721760529).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83674 + ... + 215510.

It is an arithmetic number, because the mean of its divisors is an integer number (806848560).

Almost surely, 2^19721760504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19721760504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25819153920).

19721760504 is an abundant number, since it is smaller than the sum of its proper divisors (31916547336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19721760504 is a wasteful number, since it uses less digits than its factorization.

19721760504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132140 (or 132136 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 19721760504 in words is "nineteen billion, seven hundred twenty-one million, seven hundred sixty thousand, five hundred four".