201222202121 has 4 divisors (see below), whose sum is σ = 201964719744. Its totient is φ = 200479684500.

The previous prime is 201222202099. The next prime is 201222202127. The reversal of 201222202121 is 121202222102.

It is a happy number.

201222202121 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-201222202121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201222202121.

It is not an unprimeable number, because it can be changed into a prime (201222202127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371258405 + ... + 371258946.

It is an arithmetic number, because the mean of its divisors is an integer number (50491179936).

Almost surely, 2^201222202121 is an apocalyptic number.

It is an amenable number.

201222202121 is a deficient number, since it is larger than the sum of its proper divisors (742517623).

201222202121 is an equidigital number, since it uses as much as digits as its factorization.

201222202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742517622.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 201222202121 its reverse (121202222102), we get a palindrome (322424424223).

The spelling of 201222202121 in words is "two hundred one billion, two hundred twenty-two million, two hundred two thousand, one hundred twenty-one".