122121100111 has 2 divisors, whose sum is σ = 122121100112. Its totient is φ = 122121100110.

The previous prime is 122121100021. The next prime is 122121100139. The reversal of 122121100111 is 111001121221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122121100111 - 2¹⁹ = 122120575823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122121100091 and 122121100100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122121100141) 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 as a sum of consecutive naturals, namely, 61060550055 + 61060550056.

It is an arithmetic number, because the mean of its divisors is an integer number (61060550056).

Almost surely, 2^122121100111 is an apocalyptic number.

122121100111 is a deficient number, since it is larger than the sum of its proper divisors (1).

122121100111 is an equidigital number, since it uses as much as digits as its factorization.

122121100111 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 122121100111 its reverse (111001121221), we get a palindrome (233122221332).

The spelling of 122121100111 in words is "one hundred twenty-two billion, one hundred twenty-one million, one hundred thousand, one hundred eleven".