12011212121 has 8 divisors (see below), whose sum is σ = 12644644320. Its totient is φ = 11377906272.

The previous prime is 12011212091. The next prime is 12011212139. The reversal of 12011212121 is 12121211021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011212096 and 12011212105.

It is not an unprimeable number, because it can be changed into a prime (12011212321) 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, 211646 + ... + 262328.

It is an arithmetic number, because the mean of its divisors is an integer number (1580580540).

Almost surely, 2^12011212121 is an apocalyptic number.

It is an amenable number.

12011212121 is a deficient number, since it is larger than the sum of its proper divisors (633432199).

12011212121 is a wasteful number, since it uses less digits than its factorization.

12011212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63175.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12011212121 its reverse (12121211021), we get a palindrome (24132423142).

The spelling of 12011212121 in words is "twelve billion, eleven million, two hundred twelve thousand, one hundred twenty-one".