121112211211 has 4 divisors (see below), whose sum is σ = 124066167624. Its totient is φ = 118158254800.

The previous prime is 121112211203. The next prime is 121112211217. The reversal of 121112211211 is 112112211121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112112211121 = 6473 ⋅17319977.

It is a cyclic number.

It is not a de Polignac number, because 121112211211 - 2³ = 121112211203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121112211217) 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, 1476978145 + ... + 1476978226.

It is an arithmetic number, because the mean of its divisors is an integer number (31016541906).

Almost surely, 2^121112211211 is an apocalyptic number.

121112211211 is a deficient number, since it is larger than the sum of its proper divisors (2953956413).

121112211211 is an equidigital number, since it uses as much as digits as its factorization.

121112211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953956412.

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

Adding to 121112211211 its reverse (112112211121), we get a palindrome (233224422332).

The spelling of 121112211211 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred eleven thousand, two hundred eleven".