12784021251 has 16 divisors (see below), whose sum is σ = 17671272960. Its totient is φ = 8210996640.

The previous prime is 12784021249. The next prime is 12784021307. The reversal of 12784021251 is 15212048721.

It is not a de Polignac number, because 12784021251 - 2¹ = 12784021249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12784021651) 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, 118405 + ... + 198966.

It is an arithmetic number, because the mean of its divisors is an integer number (1104454560).

Almost surely, 2^12784021251 is an apocalyptic number.

12784021251 is a deficient number, since it is larger than the sum of its proper divisors (4887251709).

12784021251 is a wasteful number, since it uses less digits than its factorization.

12784021251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317866.

The product of its (nonzero) digits is 8960, while the sum is 33.

Adding to 12784021251 its reverse (15212048721), we get a palindrome (27996069972).

The spelling of 12784021251 in words is "twelve billion, seven hundred eighty-four million, twenty-one thousand, two hundred fifty-one".