12721171154 has 16 divisors (see below), whose sum is σ = 20068190208. Its totient is φ = 6036129792.

The previous prime is 12721171153. The next prime is 12721171193. The reversal of 12721171154 is 45117112721.

It is a self number, because there is not a number n which added to its sum of digits gives 12721171154.

It is not an unprimeable number, because it can be changed into a prime (12721171153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082927 + ... + 1094610.

It is an arithmetic number, because the mean of its divisors is an integer number (1254261888).

Almost surely, 2^12721171154 is an apocalyptic number.

12721171154 is a deficient number, since it is larger than the sum of its proper divisors (7347019054).

12721171154 is a wasteful number, since it uses less digits than its factorization.

12721171154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177689.

The product of its digits is 3920, while the sum is 32.

Adding to 12721171154 its reverse (45117112721), we get a palindrome (57838283875).

The spelling of 12721171154 in words is "twelve billion, seven hundred twenty-one million, one hundred seventy-one thousand, one hundred fifty-four".