121221222120201 has 24 divisors (see below), whose sum is σ = 188629021368480. Its totient is φ = 69043636956672.

The previous prime is 121221222120179. The next prime is 121221222120203. The reversal of 121221222120201 is 102021222122121.

It is not a de Polignac number, because 121221222120201 - 2⁷ = 121221222120073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (121221222120203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1343007256 + ... + 1343097513.

It is an arithmetic number, because the mean of its divisors is an integer number (7859542557020).

Almost surely, 2^{121221222120201} is an apocalyptic number.

It is an amenable number.

121221222120201 is a deficient number, since it is larger than the sum of its proper divisors (67407799248279).

121221222120201 is a wasteful number, since it uses less digits than its factorization.

121221222120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686105093 (or 2686105086 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121221222120201 its reverse (102021222122121), we get a palindrome (223242444242322).

The spelling of 121221222120201 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred one".