19721224704 has 80 divisors (see below), whose sum is σ = 52568287200. Its totient is φ = 6570024960.

The previous prime is 19721224603. The next prime is 19721224717. The reversal of 19721224704 is 40742212791.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4681159 + ... + 4685369.

It is an arithmetic number, because the mean of its divisors is an integer number (657103590).

Almost surely, 2^19721224704 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 19721224704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26284143600).

19721224704 is an abundant number, since it is smaller than the sum of its proper divisors (32847062496).

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

19721224704 is an equidigital number, since it uses as much as digits as its factorization.

19721224704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281 (or 7265 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 19721224704 in words is "nineteen billion, seven hundred twenty-one million, two hundred twenty-four thousand, seven hundred four".