12121202101221 has 48 divisors (see below), whose sum is σ = 18132551424000. Its totient is φ = 7793366192640.

The previous prime is 12121202101189. The next prime is 12121202101241. The reversal of 12121202101221 is 12210120212121.

12121202101221 is a `hidden beast` number, since 1 + 21 + 212 + 0 + 210 + 1 + 221 = 666.

It is not a de Polignac number, because 12121202101221 - 2⁵ = 12121202101189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121202101194 and 12121202101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121202101241) 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 47 ways as a sum of consecutive naturals, for example, 1056676516 + ... + 1056687986.

It is an arithmetic number, because the mean of its divisors is an integer number (377761488000).

Almost surely, 2^{12121202101221} is an apocalyptic number.

It is an amenable number.

12121202101221 is a deficient number, since it is larger than the sum of its proper divisors (6011349322779).

12121202101221 is a wasteful number, since it uses less digits than its factorization.

12121202101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15714 (or 15711 counting only the distinct ones).

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

Adding to 12121202101221 its reverse (12210120212121), we get a palindrome (24331322313342).

The spelling of 12121202101221 in words is "twelve trillion, one hundred twenty-one billion, two hundred two million, one hundred one thousand, two hundred twenty-one".