201122012221 has 4 divisors (see below), whose sum is σ = 216592936252. Its totient is φ = 185651088192.

The previous prime is 201122012219. The next prime is 201122012249. The reversal of 201122012221 is 122210221102.

It is a happy number.

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 102454407225 + 98667604996 = 320085^2 + 314114^2 .

It is a cyclic number.

It is not a de Polignac number, because 201122012221 - 2¹ = 201122012219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201122012195 and 201122012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122012261) 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 3 ways as a sum of consecutive naturals, for example, 7735461996 + ... + 7735462021.

It is an arithmetic number, because the mean of its divisors is an integer number (54148234063).

Almost surely, 2^201122012221 is an apocalyptic number.

It is an amenable number.

201122012221 is a deficient number, since it is larger than the sum of its proper divisors (15470924031).

201122012221 is a wasteful number, since it uses less digits than its factorization.

201122012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15470924030.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201122012221 its reverse (122210221102), we get a palindrome (323332233323).

The spelling of 201122012221 in words is "two hundred one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-one".