19784782213 has 16 divisors (see below), whose sum is σ = 23851008000. Its totient is φ = 16032246192.

The previous prime is 19784782163. The next prime is 19784782217. The reversal of 19784782213 is 31228748791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19784782213 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 (19784782217) 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, 91573 + ... + 218986.

It is an arithmetic number, because the mean of its divisors is an integer number (1490688000).

Almost surely, 2^19784782213 is an apocalyptic number.

It is an amenable number.

19784782213 is a deficient number, since it is larger than the sum of its proper divisors (4066225787).

19784782213 is a wasteful number, since it uses less digits than its factorization.

19784782213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311064.

The product of its digits is 1354752, while the sum is 52.

The spelling of 19784782213 in words is "nineteen billion, seven hundred eighty-four million, seven hundred eighty-two thousand, two hundred thirteen".