121212110111 has 2 divisors, whose sum is σ = 121212110112. Its totient is φ = 121212110110.

The previous prime is 121212110101. The next prime is 121212110177. The reversal of 121212110111 is 111011212121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121212110111 - 2³⁴ = 104032240927 is a prime.

It is a super-2 number, since 2×121212110111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121212110101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606055055 + 60606055056.

It is an arithmetic number, because the mean of its divisors is an integer number (60606055056).

Almost surely, 2^121212110111 is an apocalyptic number.

121212110111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212110111 is an equidigital number, since it uses as much as digits as its factorization.

121212110111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121212110111 its reverse (111011212121), we get a palindrome (232223322232).

The spelling of 121212110111 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, one hundred eleven".