12121424121 has 16 divisors (see below), whose sum is σ = 16257024000. Its totient is φ = 8033457168.

The previous prime is 12121424113. The next prime is 12121424123. The reversal of 12121424121 is 12142412121.

It is not a de Polignac number, because 12121424121 - 2³ = 12121424113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121424123) 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, 743560 + ... + 759686.

It is an arithmetic number, because the mean of its divisors is an integer number (1016064000).

Almost surely, 2^12121424121 is an apocalyptic number.

It is an amenable number.

12121424121 is a deficient number, since it is larger than the sum of its proper divisors (4135599879).

12121424121 is a wasteful number, since it uses less digits than its factorization.

12121424121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17588.

The product of its digits is 256, while the sum is 21.

Adding to 12121424121 its reverse (12142412121), we get a palindrome (24263836242).

The spelling of 12121424121 in words is "twelve billion, one hundred twenty-one million, four hundred twenty-four thousand, one hundred twenty-one".