12722129 has 4 divisors (see below), whose sum is σ = 14539584. Its totient is φ = 10904676.

The previous prime is 12722123. The next prime is 12722131. The reversal of 12722129 is 92122721.

12722129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92122721 = 277 ⋅332573.

It is a cyclic number.

It is not a de Polignac number, because 12722129 - 2¹² = 12718033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12722098 and 12722107.

It is not an unprimeable number, because it can be changed into a prime (12722123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908717 + ... + 908730.

It is an arithmetic number, because the mean of its divisors is an integer number (3634896).

Almost surely, 2^12722129 is an apocalyptic number.

It is an amenable number.

12722129 is a deficient number, since it is larger than the sum of its proper divisors (1817455).

12722129 is an equidigital number, since it uses as much as digits as its factorization.

12722129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817454.

The product of its digits is 1008, while the sum is 26.

The square root of 12722129 is about 3566.8093585164. The cubic root of 12722129 is about 233.4460867753.

The spelling of 12722129 in words is "twelve million, seven hundred twenty-two thousand, one hundred twenty-nine".