121110211220111 has 4 divisors (see below), whose sum is σ = 121238914952424. Its totient is φ = 120981507487800.

The previous prime is 121110211220081. The next prime is 121110211220137. The reversal of 121110211220111 is 111022112011121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121110211220111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121110211220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110411220111) 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, 64351864745 + ... + 64351866626.

It is an arithmetic number, because the mean of its divisors is an integer number (30309728738106).

Almost surely, 2^{121110211220111} is an apocalyptic number.

121110211220111 is a deficient number, since it is larger than the sum of its proper divisors (128703732313).

121110211220111 is an equidigital number, since it uses as much as digits as its factorization.

121110211220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128703732312.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121110211220111 its reverse (111022112011121), we get a palindrome (232132323231232).

The spelling of 121110211220111 in words is "one hundred twenty-one trillion, one hundred ten billion, two hundred eleven million, two hundred twenty thousand, one hundred eleven".