201121111022221 has 24 divisors (see below), whose sum is σ = 218859202240224. Its totient is φ = 183726840936960.

The previous prime is 201121111022173. The next prime is 201121111022261. The reversal of 201121111022221 is 122220111121102.

It is a happy number.

It is not a de Polignac number, because 201121111022221 - 2¹⁷ = 201121110891149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121111022261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3645385966 + ... + 3645441136.

It is an arithmetic number, because the mean of its divisors is an integer number (9119133426676).

Almost surely, 2^{201121111022221} is an apocalyptic number.

It is an amenable number.

201121111022221 is a deficient number, since it is larger than the sum of its proper divisors (17738091218003).

201121111022221 is an equidigital number, since it uses as much as digits as its factorization.

201121111022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85181 (or 85084 counting only the distinct ones).

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

Adding to 201121111022221 its reverse (122220111121102), we get a palindrome (323341222143323).

The spelling of 201121111022221 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".