12423122221 has 8 divisors (see below), whose sum is σ = 12732363000. Its totient is φ = 12114178560.

The previous prime is 12423122213. The next prime is 12423122287. The reversal of 12423122221 is 12222132421.

It can be written as a sum of positive squares in 4 ways, for example, as 16281225 + 12406840996 = 4035^2 + 111386^2 .

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 12423122221 - 2³ = 12423122213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12423122192 and 12423122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12423122821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11605 + ... + 158053.

It is an arithmetic number, because the mean of its divisors is an integer number (1591545375).

Almost surely, 2^12423122221 is an apocalyptic number.

It is an amenable number.

12423122221 is a deficient number, since it is larger than the sum of its proper divisors (309240779).

12423122221 is a wasteful number, since it uses less digits than its factorization.

12423122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148559.

The product of its digits is 768, while the sum is 22.

Adding to 12423122221 its reverse (12222132421), we get a palindrome (24645254642).

The spelling of 12423122221 in words is "twelve billion, four hundred twenty-three million, one hundred twenty-two thousand, two hundred twenty-one".