12211121021121 has 64 divisors (see below), whose sum is σ = 20779273881600. Its totient is φ = 7009335000000.

The previous prime is 12211121021119. The next prime is 12211121021147. The reversal of 12211121021121 is 12112012111221.

It is a happy number.

12211121021121 is a `hidden beast` number, since 1 + 221 + 1 + 1 + 210 + 211 + 21 = 666.

12211121021121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12211121021121 - 2¹ = 12211121021119 is a prime.

It is a super-2 number, since 2×12211121021121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12211121021094 and 12211121021103.

It is not an unprimeable number, because it can be changed into a prime (12211121023121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21427371 + ... + 21989871.

It is an arithmetic number, because the mean of its divisors is an integer number (324676154400).

Almost surely, 2^{12211121021121} is an apocalyptic number.

12211121021121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211121021121 is a deficient number, since it is larger than the sum of its proper divisors (8568152860479).

12211121021121 is a wasteful number, since it uses less digits than its factorization.

12211121021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566387 (or 566381 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12211121021121 its reverse (12112012111221), we get a palindrome (24323133132342).

The spelling of 12211121021121 in words is "twelve trillion, two hundred eleven billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-one".