121201021222111 has 2 divisors, whose sum is σ = 121201021222112. Its totient is φ = 121201021222110.

The previous prime is 121201021222109. The next prime is 121201021222121. The reversal of 121201021222111 is 111222120102121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121201021222111 - 2¹ = 121201021222109 is a prime.

Together with 121201021222109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201021222121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600510611055 + 60600510611056.

It is an arithmetic number, because the mean of its divisors is an integer number (60600510611056).

Almost surely, 2^{121201021222111} is an apocalyptic number.

121201021222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201021222111 is an equidigital number, since it uses as much as digits as its factorization.

121201021222111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121201021222111 its reverse (111222120102121), we get a palindrome (232423141324232).

The spelling of 121201021222111 in words is "one hundred twenty-one trillion, two hundred one billion, twenty-one million, two hundred twenty-two thousand, one hundred eleven".