121210210111 has 2 divisors, whose sum is σ = 121210210112. Its totient is φ = 121210210110.

The previous prime is 121210210039. The next prime is 121210210139. The reversal of 121210210111 is 111012012121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (111012012121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121210210111 - 2²¹ = 121208112959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210210091 and 121210210100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210210711) 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 as a sum of consecutive naturals, namely, 60605105055 + 60605105056.

It is an arithmetic number, because the mean of its divisors is an integer number (60605105056).

Almost surely, 2^121210210111 is an apocalyptic number.

121210210111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210210111 is an equidigital number, since it uses as much as digits as its factorization.

121210210111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121210210111 its reverse (111012012121), we get a palindrome (232222222232).

The spelling of 121210210111 in words is "one hundred twenty-one billion, two hundred ten million, two hundred ten thousand, one hundred eleven".