201121212221 has 8 divisors (see below), whose sum is σ = 211721167200. Its totient is φ = 190522720080.

The previous prime is 201121212211. The next prime is 201121212239. The reversal of 201121212221 is 122212121102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201121212221 - 2³⁰ = 200047470397 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 201121212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121212211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77666 + ... + 638963.

It is an arithmetic number, because the mean of its divisors is an integer number (26465145900).

Almost surely, 2^201121212221 is an apocalyptic number.

It is an amenable number.

201121212221 is a deficient number, since it is larger than the sum of its proper divisors (10599954979).

201121212221 is a wasteful number, since it uses less digits than its factorization.

201121212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731419.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201121212221 its reverse (122212121102), we get a palindrome (323333333323).

The spelling of 201121212221 in words is "two hundred one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".