122121220220221 has 4 divisors (see below), whose sum is σ = 122194920415132. Its totient is φ = 122047520025312.

The previous prime is 122121220220201. The next prime is 122121220220257. The reversal of 122121220220221 is 122022022121221.

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 34940512102500 + 87180708117721 = 5911050^2 + 9337061^2 .

It is a cyclic number.

It is not a de Polignac number, because 122121220220221 - 2⁷ = 122121220220093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122121220220192 and 122121220220201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121220220201) 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, 36850094970 + ... + 36850098283.

It is an arithmetic number, because the mean of its divisors is an integer number (30548730103783).

Almost surely, 2^{122121220220221} is an apocalyptic number.

It is an amenable number.

122121220220221 is a deficient number, since it is larger than the sum of its proper divisors (73700194911).

122121220220221 is an equidigital number, since it uses as much as digits as its factorization.

122121220220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73700194910.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 122121220220221 its reverse (122022022121221), we get a palindrome (244143242341442).

The spelling of 122121220220221 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, two hundred twenty-one".