12121200220221 has 24 divisors (see below), whose sum is σ = 18282384783936. Its totient is φ = 7724066919360.

The previous prime is 12121200220193. The next prime is 12121200220229. The reversal of 12121200220221 is 12202200212121.

It is a happy number.

12121200220221 is a `hidden beast` number, since 1 + 2 + 1 + 21 + 200 + 220 + 221 = 666.

It is not a de Polignac number, because 12121200220221 - 2¹¹ = 12121200218173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121200220194 and 12121200220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121200220229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20134815 + ... + 20728076.

It is an arithmetic number, because the mean of its divisors is an integer number (761766032664).

Almost surely, 2^{12121200220221} is an apocalyptic number.

It is an amenable number.

12121200220221 is a deficient number, since it is larger than the sum of its proper divisors (6161184563715).

12121200220221 is a wasteful number, since it uses less digits than its factorization.

12121200220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40864353 (or 40864350 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121200220221 its reverse (12202200212121), we get a palindrome (24323400432342).

The spelling of 12121200220221 in words is "twelve trillion, one hundred twenty-one billion, two hundred million, two hundred twenty thousand, two hundred twenty-one".