121110212121 has 8 divisors (see below), whose sum is σ = 161482062144. Its totient is φ = 80739251760.

The previous prime is 121110212077. The next prime is 121110212207. The reversal of 121110212121 is 121212011121.

It is a happy number.

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

It is not a de Polignac number, because 121110212121 - 2³⁵ = 86750473753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121110212121.

It is not an unprimeable number, because it can be changed into a prime (121110212221) 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, 222195 + ... + 539991.

It is an arithmetic number, because the mean of its divisors is an integer number (20185257768).

Almost surely, 2^121110212121 is an apocalyptic number.

It is an amenable number.

121110212121 is a deficient number, since it is larger than the sum of its proper divisors (40371850023).

121110212121 is a wasteful number, since it uses less digits than its factorization.

121110212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444831.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121110212121 its reverse (121212011121), we get a palindrome (242322223242).

The spelling of 121110212121 in words is "one hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-one".