120001212121221 has 12 divisors (see below), whose sum is σ = 179754902107872. Its totient is φ = 80000808080652.

The previous prime is 120001212121207. The next prime is 120001212121223. The reversal of 120001212121221 is 122121212100021.

120001212121221 is a `hidden beast` number, since 1 + 200 + 0 + 121 + 2 + 121 + 221 = 666.

It is not a de Polignac number, because 120001212121221 - 2²² = 120001207926917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120001212121194 and 120001212121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120001212121223) 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 11 ways as a sum of consecutive naturals, for example, 246916074081 + ... + 246916074566.

It is an arithmetic number, because the mean of its divisors is an integer number (14979575175656).

Almost surely, 2^{120001212121221} is an apocalyptic number.

It is an amenable number.

120001212121221 is a deficient number, since it is larger than the sum of its proper divisors (59753689986651).

120001212121221 is an frugal number, since it uses more digits than its factorization.

120001212121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493832148662 (or 493832148650 counting only the distinct ones).

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

Adding to 120001212121221 its reverse (122121212100021), we get a palindrome (242122424221242).

The spelling of 120001212121221 in words is "one hundred twenty trillion, one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".