12821277217 has 16 divisors (see below), whose sum is σ = 14807728512. Its totient is φ = 10874142720.

The previous prime is 12821277179. The next prime is 12821277241. The reversal of 12821277217 is 71277212821.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12821277217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12821277217.

It is not an unprimeable number, because it can be changed into a prime (12821277317) 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, 230433 + ... + 280609.

It is an arithmetic number, because the mean of its divisors is an integer number (925483032).

Almost surely, 2^12821277217 is an apocalyptic number.

It is an amenable number.

12821277217 is a deficient number, since it is larger than the sum of its proper divisors (1986451295).

12821277217 is a wasteful number, since it uses less digits than its factorization.

12821277217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50568.

The product of its digits is 43904, while the sum is 40.

The spelling of 12821277217 in words is "twelve billion, eight hundred twenty-one million, two hundred seventy-seven thousand, two hundred seventeen".