12719578221 has 36 divisors (see below), whose sum is σ = 21428439552. Its totient is φ = 7249256784.

The previous prime is 12719578199. The next prime is 12719578247. The reversal of 12719578221 is 12287591721.

12719578221 is a `hidden beast` number, since 1 + 2 + 71 + 9 + 578 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 12719578221 - 2¹⁰ = 12719577197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12719578021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 131250 + ... + 206556.

It is an arithmetic number, because the mean of its divisors is an integer number (595234432).

Almost surely, 2^12719578221 is an apocalyptic number.

It is an amenable number.

12719578221 is a deficient number, since it is larger than the sum of its proper divisors (8708861331).

12719578221 is a wasteful number, since it uses less digits than its factorization.

12719578221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75710 (or 75700 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The spelling of 12719578221 in words is "twelve billion, seven hundred nineteen million, five hundred seventy-eight thousand, two hundred twenty-one".