12421212121 has 8 divisors (see below), whose sum is σ = 12659169600. Its totient is φ = 12184169040.

The previous prime is 12421212119. The next prime is 12421212137. The reversal of 12421212121 is 12121212421.

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 12421212121 - 2¹ = 12421212119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421212191) 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, 201141 + ... + 255538.

It is an arithmetic number, because the mean of its divisors is an integer number (1582396200).

Almost surely, 2^12421212121 is an apocalyptic number.

It is an amenable number.

12421212121 is a deficient number, since it is larger than the sum of its proper divisors (237957479).

12421212121 is an equidigital number, since it uses as much as digits as its factorization.

12421212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457199.

The product of its digits is 128, while the sum is 19.

Adding to 12421212121 its reverse (12121212421), we get a palindrome (24542424542).

The spelling of 12421212121 in words is "twelve billion, four hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".