201220112021221 has 4 divisors (see below), whose sum is σ = 201389631914592. Its totient is φ = 201050592127852.

The previous prime is 201220112021209. The next prime is 201220112021231. The reversal of 201220112021221 is 122120211022102.

201220112021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201220112021221 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 (201220112021231) 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, 84759944905 + ... + 84759947278.

It is an arithmetic number, because the mean of its divisors is an integer number (50347407978648).

Almost surely, 2^{201220112021221} is an apocalyptic number.

It is an amenable number.

201220112021221 is a deficient number, since it is larger than the sum of its proper divisors (169519893371).

201220112021221 is a wasteful number, since it uses less digits than its factorization.

201220112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169519893370.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201220112021221 its reverse (122120211022102), we get a palindrome (323340323043323).

The spelling of 201220112021221 in words is "two hundred one trillion, two hundred twenty billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".