12101120212221 has 24 divisors (see below), whose sum is σ = 18015697557624. Its totient is φ = 7821441492480.

The previous prime is 12101120212199. The next prime is 12101120212271. The reversal of 12101120212221 is 12221202110121.

12101120212221 is a `hidden beast` number, since 1 + 210 + 1 + 1 + 20 + 212 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3655476324900 + 8445643887321 = 1911930^2 + 2906139^2 .

It is not a de Polignac number, because 12101120212221 - 2¹⁵ = 12101120179453 is a prime.

It is a super-2 number, since 2×12101120212221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12101120212194 and 12101120212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101120212271) 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, 64567816 + ... + 64754961.

It is an arithmetic number, because the mean of its divisors is an integer number (750654064901).

Almost surely, 2^{12101120212221} is an apocalyptic number.

It is an amenable number.

12101120212221 is a deficient number, since it is larger than the sum of its proper divisors (5914577345403).

12101120212221 is a wasteful number, since it uses less digits than its factorization.

12101120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129323101 (or 129323098 counting only the distinct ones).

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

Adding to 12101120212221 its reverse (12221202110121), we get a palindrome (24322322322342).

The spelling of 12101120212221 in words is "twelve trillion, one hundred one billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".