121211111121 has 8 divisors (see below), whose sum is σ = 161616692640. Its totient is φ = 80806468512.

The previous prime is 121211111081. The next prime is 121211111129. The reversal of 121211111121 is 121111112121.

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

It is not a de Polignac number, because 121211111121 - 2⁶ = 121211111057 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121211111121.

It is not an unprimeable number, because it can be changed into a prime (121211111129) 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, 162570 + ... + 518508.

It is an arithmetic number, because the mean of its divisors is an integer number (20202086580).

Almost surely, 2^121211111121 is an apocalyptic number.

It is an amenable number.

121211111121 is a deficient number, since it is larger than the sum of its proper divisors (40405581519).

121211111121 is a wasteful number, since it uses less digits than its factorization.

121211111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469455.

The product of its digits is 8, while the sum is 15.

Adding to 121211111121 its reverse (121111112121), we get a palindrome (242322223242).

The spelling of 121211111121 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".