121000220221 has 4 divisors (see below), whose sum is σ = 128117880252. Its totient is φ = 113882560192.

The previous prime is 121000220213. The next prime is 121000220267. The reversal of 121000220221 is 122022000121.

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 108903300025 + 12096920196 = 330005^2 + 109986^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000220221 - 2³ = 121000220213 is a prime.

It is a super-3 number, since 3×121000220221³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000227221) 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, 3558829990 + ... + 3558830023.

It is an arithmetic number, because the mean of its divisors is an integer number (32029470063).

Almost surely, 2^121000220221 is an apocalyptic number.

It is an amenable number.

121000220221 is a deficient number, since it is larger than the sum of its proper divisors (7117660031).

121000220221 is an equidigital number, since it uses as much as digits as its factorization.

121000220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117660030.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121000220221 its reverse (122022000121), we get a palindrome (243022220342).

The spelling of 121000220221 in words is "one hundred twenty-one billion, two hundred twenty thousand, two hundred twenty-one".