12421223121 has 48 divisors (see below), whose sum is σ = 17521539840. Its totient is φ = 7823208960.

The previous prime is 12421223119. The next prime is 12421223233. The reversal of 12421223121 is 12132212421.

It is a happy number.

12421223121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12421223121 - 2¹ = 12421223119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12421221121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44203501 + ... + 44203781.

It is an arithmetic number, because the mean of its divisors is an integer number (365032080).

Almost surely, 2^12421223121 is an apocalyptic number.

It is an amenable number.

12421223121 is a deficient number, since it is larger than the sum of its proper divisors (5100316719).

12421223121 is a wasteful number, since it uses less digits than its factorization.

12421223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 597 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

Adding to 12421223121 its reverse (12132212421), we get a palindrome (24553435542).

The spelling of 12421223121 in words is "twelve billion, four hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-one".