201121212311 has 16 divisors (see below), whose sum is σ = 204328869888. Its totient is φ = 197945143200.

The previous prime is 201121212289. The next prime is 201121212323. The reversal of 201121212311 is 113212121102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201121212311 - 2¹⁰ = 201121211287 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 201121212311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121212361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8321801 + ... + 8345933.

It is an arithmetic number, because the mean of its divisors is an integer number (12770554368).

Almost surely, 2^201121212311 is an apocalyptic number.

201121212311 is a deficient number, since it is larger than the sum of its proper divisors (3207657577).

201121212311 is a wasteful number, since it uses less digits than its factorization.

201121212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24782.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 201121212311 its reverse (113212121102), we get a palindrome (314333333413).

The spelling of 201121212311 in words is "two hundred one billion, one hundred twenty-one million, two hundred twelve thousand, three hundred eleven".