121220102001221 has 16 divisors (see below), whose sum is σ = 122082551585280. Its totient is φ = 120361226279040.

The previous prime is 121220102001191. The next prime is 121220102001227. The reversal of 121220102001221 is 122100201022121.

It is a cyclic number.

It is not a de Polignac number, because 121220102001221 - 2¹⁰ = 121220102000197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220102001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220102001227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125282936 + ... + 126246798.

It is an arithmetic number, because the mean of its divisors is an integer number (7630159474080).

Almost surely, 2^{121220102001221} is an apocalyptic number.

It is an amenable number.

121220102001221 is a deficient number, since it is larger than the sum of its proper divisors (862449584059).

121220102001221 is a wasteful number, since it uses less digits than its factorization.

121220102001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965716.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121220102001221 its reverse (122100201022121), we get a palindrome (243320303023342).

The spelling of 121220102001221 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred two million, one thousand, two hundred twenty-one".