201121022212221 has 16 divisors (see below), whose sum is σ = 276095772819648. Its totient is φ = 130131550368000.

The previous prime is 201121022212217. The next prime is 201121022212223. The reversal of 201121022212221 is 122212220121102.

It is not a de Polignac number, because 201121022212221 - 2² = 201121022212217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121022212223) 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, 2259183795 + ... + 2259272816.

It is an arithmetic number, because the mean of its divisors is an integer number (17255985801228).

Almost surely, 2^{201121022212221} is an apocalyptic number.

It is an amenable number.

201121022212221 is a deficient number, since it is larger than the sum of its proper divisors (74974750607427).

201121022212221 is a wasteful number, since it uses less digits than its factorization.

201121022212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518457052.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 201121022212221 its reverse (122212220121102), we get a palindrome (323333242333323).

The spelling of 201121022212221 in words is "two hundred one trillion, one hundred twenty-one billion, twenty-two million, two hundred twelve thousand, two hundred twenty-one".