201112211221 has 4 divisors (see below), whose sum is σ = 201143058444. Its totient is φ = 201081364000.

The previous prime is 201112211197. The next prime is 201112211281. The reversal of 201112211221 is 122112211102.

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 100844988721 + 100267222500 = 317561^2 + 316650^2 .

It is a cyclic number.

It is not a de Polignac number, because 201112211221 - 2⁷ = 201112211093 is a prime.

It is a super-2 number, since 2×201112211221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201112211195 and 201112211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201112211281) 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, 15413830 + ... + 15426871.

It is an arithmetic number, because the mean of its divisors is an integer number (50285764611).

Almost surely, 2^201112211221 is an apocalyptic number.

It is an amenable number.

201112211221 is a deficient number, since it is larger than the sum of its proper divisors (30847223).

201112211221 is an equidigital number, since it uses as much as digits as its factorization.

201112211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30847222.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201112211221 its reverse (122112211102), we get a palindrome (323224422323).

The spelling of 201112211221 in words is "two hundred one billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty-one".