12729492721 has 8 divisors (see below), whose sum is σ = 13948994304. Its totient is φ = 11520370320.

The previous prime is 12729492703. The next prime is 12729492731.

12729492721 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 12729492721 - 2⁵ = 12729492689 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12729492731) 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, 2592226 + ... + 2597131.

It is an arithmetic number, because the mean of its divisors is an integer number (1743624288).

Almost surely, 2^12729492721 is an apocalyptic number.

12729492721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12729492721 is a deficient number, since it is larger than the sum of its proper divisors (1219501583).

12729492721 is a wasteful number, since it uses less digits than its factorization.

12729492721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189591.

The product of its digits is 254016, while the sum is 46.

The spelling of 12729492721 in words is "twelve billion, seven hundred twenty-nine million, four hundred ninety-two thousand, seven hundred twenty-one".