12721121115 has 8 divisors (see below), whose sum is σ = 20353793808. Its totient is φ = 6784597920.

The previous prime is 12721121113. The next prime is 12721121117. The reversal of 12721121115 is 51112112721.

It is an interprime number because it is at equal distance from previous prime (12721121113) and next prime (12721121117).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12721121115 - 2¹ = 12721121113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12721121113) 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, 424037356 + ... + 424037385.

It is an arithmetic number, because the mean of its divisors is an integer number (2544224226).

Almost surely, 2^12721121115 is an apocalyptic number.

12721121115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12721121115 is a deficient number, since it is larger than the sum of its proper divisors (7632672693).

12721121115 is an equidigital number, since it uses as much as digits as its factorization.

12721121115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848074749.

The product of its digits is 280, while the sum is 24.

Adding to 12721121115 its reverse (51112112721), we get a palindrome (63833233836).

It can be divided in two parts, 12 and 721121115, that added together give a palindrome (721121127).

The spelling of 12721121115 in words is "twelve billion, seven hundred twenty-one million, one hundred twenty-one thousand, one hundred fifteen".