12784219881 has 16 divisors (see below), whose sum is σ = 18220567680. Its totient is φ = 7953418880.

The previous prime is 12784219873. The next prime is 12784219907. The reversal of 12784219881 is 18891248721.

It is a cyclic number.

It is not a de Polignac number, because 12784219881 - 2³ = 12784219873 is a prime.

It is a super-3 number, since 3×12784219881³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12784219841) 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, 2256666 + ... + 2262323.

It is an arithmetic number, because the mean of its divisors is an integer number (1138785480).

Almost surely, 2^12784219881 is an apocalyptic number.

It is an amenable number.

12784219881 is a deficient number, since it is larger than the sum of its proper divisors (5436347799).

12784219881 is a wasteful number, since it uses less digits than its factorization.

12784219881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519056.

The product of its digits is 516096, while the sum is 51.

The spelling of 12784219881 in words is "twelve billion, seven hundred eighty-four million, two hundred nineteen thousand, eight hundred eighty-one".