121021020221 has 4 divisors (see below), whose sum is σ = 121025497212. Its totient is φ = 121016543232.

The previous prime is 121021020203. The next prime is 121021020229. The reversal of 121021020221 is 122020120121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23668284025 + 97352736196 = 153845^2 + 312014^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021020221 - 2¹⁴ = 121021003837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021020196 and 121021020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021020229) 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 3 ways as a sum of consecutive naturals, for example, 2197700 + ... + 2252093.

It is an arithmetic number, because the mean of its divisors is an integer number (30256374303).

Almost surely, 2^121021020221 is an apocalyptic number.

It is an amenable number.

121021020221 is a deficient number, since it is larger than the sum of its proper divisors (4476991).

121021020221 is an equidigital number, since it uses as much as digits as its factorization.

121021020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476990.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121021020221 its reverse (122020120121), we get a palindrome (243041140342).

The spelling of 121021020221 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand, two hundred twenty-one".