12421442221 has 16 divisors (see below), whose sum is σ = 12731857920. Its totient is φ = 12114638640.

The previous prime is 12421442219. The next prime is 12421442237. The reversal of 12421442221 is 12224412421.

It is a cyclic number.

It is not a de Polignac number, because 12421442221 - 2¹ = 12421442219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421442291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10606966 + ... + 10608136.

It is an arithmetic number, because the mean of its divisors is an integer number (795741120).

Almost surely, 2^12421442221 is an apocalyptic number.

It is an amenable number.

12421442221 is a deficient number, since it is larger than the sum of its proper divisors (310415699).

12421442221 is a wasteful number, since it uses less digits than its factorization.

12421442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496.

The product of its digits is 2048, while the sum is 25.

Adding to 12421442221 its reverse (12224412421), we get a palindrome (24645854642).

The spelling of 12421442221 in words is "twelve billion, four hundred twenty-one million, four hundred forty-two thousand, two hundred twenty-one".