121102212121 has 16 divisors (see below), whose sum is σ = 137920939200. Its totient is φ = 105321384000.

The previous prime is 121102212073. The next prime is 121102212139. The reversal of 121102212121 is 121212201121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121102212121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121102212095 and 121102212104.

It is not an unprimeable number, because it can be changed into a prime (121102212181) 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, 1706655 + ... + 1776196.

It is an arithmetic number, because the mean of its divisors is an integer number (8620058700).

Almost surely, 2^121102212121 is an apocalyptic number.

121102212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121102212121 is a deficient number, since it is larger than the sum of its proper divisors (16818727079).

121102212121 is a wasteful number, since it uses less digits than its factorization.

121102212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483000.

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

Adding to 121102212121 its reverse (121212201121), we get a palindrome (242314413242).

The spelling of 121102212121 in words is "one hundred twenty-one billion, one hundred two million, two hundred twelve thousand, one hundred twenty-one".