12721115011 has 48 divisors (see below), whose sum is σ = 16194274560. Its totient is φ = 9862110720.

The previous prime is 12721114981. The next prime is 12721115027. The reversal of 12721115011 is 11051112721.

It is not a de Polignac number, because 12721115011 - 2⁵ = 12721114979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12721115041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1384645 + ... + 1393801.

It is an arithmetic number, because the mean of its divisors is an integer number (337380720).

Almost surely, 2^12721115011 is an apocalyptic number.

12721115011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12721115011 is a deficient number, since it is larger than the sum of its proper divisors (3473159549).

12721115011 is a wasteful number, since it uses less digits than its factorization.

12721115011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9244 (or 9227 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 22.

Adding to 12721115011 its reverse (11051112721), we get a palindrome (23772227732).

The spelling of 12721115011 in words is "twelve billion, seven hundred twenty-one million, one hundred fifteen thousand, eleven".