121001102220221 has 12 divisors (see below), whose sum is σ = 123019882454196. Its totient is φ = 119014926174720.

The previous prime is 121001102220217. The next prime is 121001102220227. The reversal of 121001102220221 is 122022201100121.

It can be written as a sum of positive squares in 6 ways, for example, as 26538467402500 + 94462634817721 = 5151550^2 + 9719189^2 .

It is not a de Polignac number, because 121001102220221 - 2² = 121001102220217 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 121001102220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001102220227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186742415 + ... + 187389251.

It is an arithmetic number, because the mean of its divisors is an integer number (10251656871183).

Almost surely, 2^{121001102220221} is an apocalyptic number.

It is an amenable number.

121001102220221 is a deficient number, since it is larger than the sum of its proper divisors (2018780233975).

121001102220221 is an frugal number, since it uses more digits than its factorization.

121001102220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697232 (or 697171 counting only the distinct ones).

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

Adding to 121001102220221 its reverse (122022201100121), we get a palindrome (243023303320342).

The spelling of 121001102220221 in words is "one hundred twenty-one trillion, one billion, one hundred two million, two hundred twenty thousand, two hundred twenty-one".