121112221111 has 8 divisors (see below), whose sum is σ = 138560135040. Its totient is φ = 103700849208.

The previous prime is 121112221081. The next prime is 121112221157. The reversal of 121112221111 is 111122211121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121112221111 - 2⁹ = 121112220599 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 (121112221171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9128401 + ... + 9141658.

It is an arithmetic number, because the mean of its divisors is an integer number (17320016880).

Almost surely, 2^121112221111 is an apocalyptic number.

121112221111 is a deficient number, since it is larger than the sum of its proper divisors (17447913929).

121112221111 is an equidigital number, since it uses as much as digits as its factorization.

121112221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18271013.

The product of its digits is 16, while the sum is 16.

Adding to 121112221111 its reverse (111122211121), we get a palindrome (232234432232).

It can be divided in two parts, 1 and 21112221111, that added together give a palindrome (21112221112).

The spelling of 121112221111 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, one hundred eleven".