121212120111 has 8 divisors (see below), whose sum is σ = 170122273920. Its totient is φ = 76555023192.

The previous prime is 121212120103. The next prime is 121212120167. The reversal of 121212120111 is 111021212121.

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 121212120111 - 2³ = 121212120103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212120191) 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, 1063264155 + ... + 1063264268.

It is an arithmetic number, because the mean of its divisors is an integer number (21265284240).

Almost surely, 2^121212120111 is an apocalyptic number.

121212120111 is a deficient number, since it is larger than the sum of its proper divisors (48910153809).

121212120111 is a wasteful number, since it uses less digits than its factorization.

121212120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126528445.

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

Adding to 121212120111 its reverse (111021212121), we get a palindrome (232233332232).

The spelling of 121212120111 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred eleven".