12121011220221 has 24 divisors (see below), whose sum is σ = 19513702278720. Its totient is φ = 7205059299456.

The previous prime is 12121011220217. The next prime is 12121011220237. The reversal of 12121011220221 is 12202211012121.

12121011220221 is a `hidden beast` number, since 1 + 2 + 1 + 210 + 11 + 220 + 221 = 666.

12121011220221 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 12121011220221 - 2² = 12121011220217 is a prime.

It is a super-3 number, since 3×12121011220221³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12121011220194 and 12121011220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121011220271) 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, 2084794345 + ... + 2084800158.

It is an arithmetic number, because the mean of its divisors is an integer number (813070928280).

Almost surely, 2^{12121011220221} is an apocalyptic number.

It is an amenable number.

12121011220221 is a deficient number, since it is larger than the sum of its proper divisors (7392691058499).

12121011220221 is a wasteful number, since it uses less digits than its factorization.

12121011220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169594545 (or 4169594542 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12121011220221 its reverse (12202211012121), we get a palindrome (24323222232342).

The spelling of 12121011220221 in words is "twelve trillion, one hundred twenty-one billion, eleven million, two hundred twenty thousand, two hundred twenty-one".