121222120210111 has 4 divisors (see below), whose sum is σ = 126492647175792. Its totient is φ = 115951593244432.

The previous prime is 121222120210091. The next prime is 121222120210153. The reversal of 121222120210111 is 111012021222121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121222120210111 - 2²⁷ = 121221985992383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222120220111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2635263482806 + ... + 2635263482851.

It is an arithmetic number, because the mean of its divisors is an integer number (31623161793948).

Almost surely, 2^{121222120210111} is an apocalyptic number.

121222120210111 is a deficient number, since it is larger than the sum of its proper divisors (5270526965681).

121222120210111 is an equidigital number, since it uses as much as digits as its factorization.

121222120210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270526965680.

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

Adding to 121222120210111 its reverse (111012021222121), we get a palindrome (232234141432232).

The spelling of 121222120210111 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred ten thousand, one hundred eleven".