12212121121 has 8 divisors (see below), whose sum is σ = 12660171264. Its totient is φ = 11767452960.

The previous prime is 12212121079. The next prime is 12212121143. The reversal of 12212121121 is 12112121221.

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 12212121121 - 2¹⁹ = 12211596833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212121095 and 12212121104.

It is not an unprimeable number, because it can be changed into a prime (12212121151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838141 + ... + 852586.

It is an arithmetic number, because the mean of its divisors is an integer number (1582521408).

Almost surely, 2^12212121121 is an apocalyptic number.

It is an amenable number.

12212121121 is a deficient number, since it is larger than the sum of its proper divisors (448050143).

12212121121 is a wasteful number, since it uses less digits than its factorization.

12212121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690991.

The product of its digits is 32, while the sum is 16.

Adding to 12212121121 its reverse (12112121221), we get a palindrome (24324242342).

The spelling of 12212121121 in words is "twelve billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".