12784448721 has 12 divisors (see below), whose sum is σ = 18736437776. Its totient is φ = 7748150520.

The previous prime is 12784448713. The next prime is 12784448753.

12784448721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12784448721 - 2³ = 12784448713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12784448021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17609071 + ... + 17609796.

Almost surely, 2^12784448721 is an apocalyptic number.

12784448721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12784448721 is a deficient number, since it is larger than the sum of its proper divisors (5951989055).

12784448721 is a wasteful number, since it uses less digits than its factorization.

12784448721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35218892 (or 35218881 counting only the distinct ones).

The product of its digits is 802816, while the sum is 48.

The spelling of 12784448721 in words is "twelve billion, seven hundred eighty-four million, four hundred forty-eight thousand, seven hundred twenty-one".