121121202001221 has 24 divisors (see below), whose sum is σ = 180871245145344. Its totient is φ = 78044805266400.

The previous prime is 121121202001211. The next prime is 121121202001243. The reversal of 121121202001221 is 122100202121121.

121121202001221 is a `hidden beast` number, since 1 + 211 + 212 + 0 + 20 + 0 + 1 + 221 = 666.

It is not a de Polignac number, because 121121202001221 - 2²⁶ = 121121134892357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121121202001194 and 121121202001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121202001201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1204344861 + ... + 1204445426.

It is an arithmetic number, because the mean of its divisors is an integer number (7536301881056).

Almost surely, 2^{121121202001221} is an apocalyptic number.

It is an amenable number.

121121202001221 is a deficient number, since it is larger than the sum of its proper divisors (59750043144123).

121121202001221 is a wasteful number, since it uses less digits than its factorization.

121121202001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408790481 (or 2408790478 counting only the distinct ones).

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

Adding to 121121202001221 its reverse (122100202121121), we get a palindrome (243221404122342).

The spelling of 121121202001221 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred two million, one thousand, two hundred twenty-one".