201331330121221 has 6 divisors (see below), whose sum is σ = 210465454739750. Its totient is φ = 192577794028488.

The previous prime is 201331330121213. The next prime is 201331330121231. The reversal of 201331330121221 is 122121033133102.

It can be written as a sum of positive squares in only one way, i.e., 112707651700996 + 88623678420225 = 10616386^2 + 9414015^2 .

It is not a de Polignac number, because 201331330121221 - 2³ = 201331330121213 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 (201331330121231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190294262346 + ... + 190294263403.

Almost surely, 2^{201331330121221} is an apocalyptic number.

It is an amenable number.

201331330121221 is a deficient number, since it is larger than the sum of its proper divisors (9134124618529).

201331330121221 is an equidigital number, since it uses as much as digits as its factorization.

201331330121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380588525795 (or 380588525772 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 201331330121221 its reverse (122121033133102), we get a palindrome (323452363254323).

The spelling of 201331330121221 in words is "two hundred one trillion, three hundred thirty-one billion, three hundred thirty million, one hundred twenty-one thousand, two hundred twenty-one".