121020020220221 has 4 divisors (see below), whose sum is σ = 121113906971100. Its totient is φ = 120926133469344.

The previous prime is 121020020220149. The next prime is 121020020220247. The reversal of 121020020220221 is 122022020020121.

It is a happy number.

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 64132388392900 + 56887631827321 = 8008270^2 + 7542389^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020020220221 - 2¹⁴ = 121020020203837 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 121020020220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020050220221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46943373506 + ... + 46943376083.

It is an arithmetic number, because the mean of its divisors is an integer number (30278476742775).

Almost surely, 2^{121020020220221} is an apocalyptic number.

It is an amenable number.

121020020220221 is a deficient number, since it is larger than the sum of its proper divisors (93886750879).

121020020220221 is an equidigital number, since it uses as much as digits as its factorization.

121020020220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93886750878.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121020020220221 its reverse (122022020020121), we get a palindrome (243042040240342).

The spelling of 121020020220221 in words is "one hundred twenty-one trillion, twenty billion, twenty million, two hundred twenty thousand, two hundred twenty-one".