121111221211211 has 24 divisors (see below), whose sum is σ = 153731381852160. Its totient is φ = 94348297789200.

The previous prime is 121111221211199. The next prime is 121111221211231. The reversal of 121111221211211 is 112112122111121.

It is a de Polignac number, because none of the positive numbers 2^k-121111221211211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121111221211231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26555195 + ... + 30779876.

It is an arithmetic number, because the mean of its divisors is an integer number (6405474243840).

Almost surely, 2^{121111221211211} is an apocalyptic number.

121111221211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121111221211211 is a deficient number, since it is larger than the sum of its proper divisors (32620160640949).

121111221211211 is a wasteful number, since it uses less digits than its factorization.

121111221211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57339015 (or 57339008 counting only the distinct ones).

The product of its digits is 32, while the sum is 20.

Adding to 121111221211211 its reverse (112112122111121), we get a palindrome (233223343322332).

The spelling of 121111221211211 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred eleven".