121022220221 has 12 divisors (see below), whose sum is σ = 140787012060. Its totient is φ = 103728864960.

The previous prime is 121022220217. The next prime is 121022220239. The reversal of 121022220221 is 122022220121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 111479860996 + 9542359225 = 333886^2 + 97685^2 .

It is not a de Polignac number, because 121022220221 - 2² = 121022220217 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 121022220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022220251) 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, 1642745 + ... + 1714833.

It is an arithmetic number, because the mean of its divisors is an integer number (11732251005).

Almost surely, 2^121022220221 is an apocalyptic number.

It is an amenable number.

121022220221 is a deficient number, since it is larger than the sum of its proper divisors (19764791839).

121022220221 is an equidigital number, since it uses as much as digits as its factorization.

121022220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106364 (or 106357 counting only the distinct ones).

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

Adding to 121022220221 its reverse (122022220121), we get a palindrome (243044440342).

The spelling of 121022220221 in words is "one hundred twenty-one billion, twenty-two million, two hundred twenty thousand, two hundred twenty-one".