201220111222201 has 4 divisors (see below), whose sum is σ = 205016717094372. Its totient is φ = 197423505350032.

The previous prime is 201220111222181. The next prime is 201220111222237. The reversal of 201220111222201 is 102222111022102.

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 79411695432976 + 121808415789225 = 8911324^2 + 11036685^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220111222201 - 2¹¹ = 201220111220153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201220111222301) 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, 1898302936006 + ... + 1898302936111.

It is an arithmetic number, because the mean of its divisors is an integer number (51254179273593).

Almost surely, 2^{201220111222201} is an apocalyptic number.

It is an amenable number.

201220111222201 is a deficient number, since it is larger than the sum of its proper divisors (3796605872171).

201220111222201 is an equidigital number, since it uses as much as digits as its factorization.

201220111222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796605872170.

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

Adding to 201220111222201 its reverse (102222111022102), we get a palindrome (303442222244303).

The spelling of 201220111222201 in words is "two hundred one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-two thousand, two hundred one".