121221021211111 has 2 divisors, whose sum is σ = 121221021211112. Its totient is φ = 121221021211110.

The previous prime is 121221021211099. The next prime is 121221021211151. The reversal of 121221021211111 is 111112120122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221021211111 - 2⁷ = 121221021210983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221021211151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610510605555 + 60610510605556.

It is an arithmetic number, because the mean of its divisors is an integer number (60610510605556).

Almost surely, 2^{121221021211111} is an apocalyptic number.

121221021211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221021211111 is an equidigital number, since it uses as much as digits as its factorization.

121221021211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121221021211111 its reverse (111112120122121), we get a palindrome (232333141333232).

The spelling of 121221021211111 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred eleven thousand, one hundred eleven".