201120121212221 has 4 divisors (see below), whose sum is σ = 201120789559932. Its totient is φ = 201119452864512.

The previous prime is 201120121212203. The next prime is 201120121212229. The reversal of 201120121212221 is 122212121021102.

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 21401162047321 + 179718959164900 = 4626139^2 + 13405930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201120121212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201120121212193 and 201120121212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201120121212229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333722270 + ... + 334324383.

It is an arithmetic number, because the mean of its divisors is an integer number (50280197389983).

Almost surely, 2^{201120121212221} is an apocalyptic number.

It is an amenable number.

201120121212221 is a deficient number, since it is larger than the sum of its proper divisors (668347711).

201120121212221 is an equidigital number, since it uses as much as digits as its factorization.

201120121212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668347710.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201120121212221 its reverse (122212121021102), we get a palindrome (323332242233323).

The spelling of 201120121212221 in words is "two hundred one trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".