121221201101221 has 8 divisors (see below), whose sum is σ = 130633347552120. Its totient is φ = 111821545889472.

The previous prime is 121221201101159. The next prime is 121221201101233. The reversal of 121221201101221 is 122101102122121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20043976702500 + 101177224398721 = 4477050^2 + 10058689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121221201101221 - 2¹⁹ = 121221200576933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221201101291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3122789626 + ... + 3122828443.

It is an arithmetic number, because the mean of its divisors is an integer number (16329168444015).

Almost surely, 2^{121221201101221} is an apocalyptic number.

It is an amenable number.

121221201101221 is a deficient number, since it is larger than the sum of its proper divisors (9412146450899).

121221201101221 is a wasteful number, since it uses less digits than its factorization.

121221201101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6245619575.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121221201101221 its reverse (122101102122121), we get a palindrome (243322303223342).

The spelling of 121221201101221 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred one million, one hundred one thousand, two hundred twenty-one".