121222220111 has 2 divisors, whose sum is σ = 121222220112. Its totient is φ = 121222220110.

The previous prime is 121222220099. The next prime is 121222220137. The reversal of 121222220111 is 111022222121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121222220111 - 2³⁰ = 120148478287 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121222220111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121222220411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611110055 + 60611110056.

It is an arithmetic number, because the mean of its divisors is an integer number (60611110056).

Almost surely, 2^121222220111 is an apocalyptic number.

121222220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121222220111 is an equidigital number, since it uses as much as digits as its factorization.

121222220111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121222220111 its reverse (111022222121), we get a palindrome (232244442232).

The spelling of 121222220111 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred eleven".