12211100121 has 32 divisors (see below), whose sum is σ = 18260195328. Its totient is φ = 7193327040.

The previous prime is 12211100009. The next prime is 12211100147. The reversal of 12211100121 is 12100111221.

It is not a de Polignac number, because 12211100121 - 2¹⁰ = 12211099097 is a prime.

It is a super-2 number, since 2×12211100121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211100097 and 12211100106.

It is not an unprimeable number, because it can be changed into a prime (12211100191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1342230 + ... + 1351296.

It is an arithmetic number, because the mean of its divisors is an integer number (570631104).

Almost surely, 2^12211100121 is an apocalyptic number.

12211100121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211100121 is a deficient number, since it is larger than the sum of its proper divisors (6049095207).

12211100121 is a wasteful number, since it uses less digits than its factorization.

12211100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10221.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12211100121 its reverse (12100111221), we get a palindrome (24311211342).

It can be divided in two parts, 12211100 and 121, that added together give a palindrome (12211221).

The spelling of 12211100121 in words is "twelve billion, two hundred eleven million, one hundred thousand, one hundred twenty-one".