12021121120221 has 6 divisors (see below), whose sum is σ = 17363841618110. Its totient is φ = 8014080746808.

The previous prime is 12021121120193. The next prime is 12021121120247. The reversal of 12021121120221 is 12202112112021.

12021121120221 is a `hidden beast` number, since 1 + 2 + 0 + 211 + 211 + 20 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11612685092121 + 408436028100 = 3407739^2 + 639090^2 .

It is not a de Polignac number, because 12021121120221 - 2⁵ = 12021121120189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021121120194 and 12021121120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021121140221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667840062226 + ... + 667840062243.

Almost surely, 2^{12021121120221} is an apocalyptic number.

It is an amenable number.

12021121120221 is a deficient number, since it is larger than the sum of its proper divisors (5342720497889).

12021121120221 is a wasteful number, since it uses less digits than its factorization.

12021121120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335680124475 (or 1335680124472 counting only the distinct ones).

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

Adding to 12021121120221 its reverse (12202112112021), we get a palindrome (24223233232242).

The spelling of 12021121120221 in words is "twelve trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".