12722422721 has 4 divisors (see below), whose sum is σ = 12722661252. Its totient is φ = 12722184192.

The previous prime is 12722422711. The next prime is 12722422747.

12722422721 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2842062721 + 9880360000 = 53311^2 + 99400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12722422721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12722422711) 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, 1505 + ... + 159521.

It is an arithmetic number, because the mean of its divisors is an integer number (3180665313).

Almost surely, 2^12722422721 is an apocalyptic number.

It is an amenable number.

12722422721 is a deficient number, since it is larger than the sum of its proper divisors (238531).

12722422721 is an equidigital number, since it uses as much as digits as its factorization.

12722422721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238530.

The product of its digits is 12544, while the sum is 32.

The spelling of 12722422721 in words is "twelve billion, seven hundred twenty-two million, four hundred twenty-two thousand, seven hundred twenty-one".