121212222111 has 48 divisors (see below), whose sum is σ = 187456259328. Its totient is φ = 75333888000.

The previous prime is 121212222097. The next prime is 121212222119. The reversal of 121212222111 is 111222212121.

121212222111 is a `hidden beast` number, since 121 + 212 + 222 + 111 = 666.

It is not a de Polignac number, because 121212222111 - 2¹³ = 121212213919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212222119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 984495 + ... + 1100751.

It is an arithmetic number, because the mean of its divisors is an integer number (3905338736).

Almost surely, 2^121212222111 is an apocalyptic number.

121212222111 is a deficient number, since it is larger than the sum of its proper divisors (66244037217).

121212222111 is a wasteful number, since it uses less digits than its factorization.

121212222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116432 (or 116429 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121212222111 its reverse (111222212121), we get a palindrome (232434434232).

The spelling of 121212222111 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred eleven".