121112110121111 has 4 divisors (see below), whose sum is σ = 121117175689800. Its totient is φ = 121107044552424.

The previous prime is 121112110121053. The next prime is 121112110121131. The reversal of 121112110121111 is 111121011211121.

It is a happy number.

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-121112110121111 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 121112110121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112110121131) 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, 2532748481 + ... + 2532796298.

It is an arithmetic number, because the mean of its divisors is an integer number (30279293922450).

Almost surely, 2^{121112110121111} is an apocalyptic number.

121112110121111 is a deficient number, since it is larger than the sum of its proper divisors (5065568689).

121112110121111 is an equidigital number, since it uses as much as digits as its factorization.

121112110121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065568688.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 121112110121111 its reverse (111121011211121), we get a palindrome (232233121332232).

The spelling of 121112110121111 in words is "one hundred twenty-one trillion, one hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, one hundred eleven".