201122122221 has 24 divisors (see below), whose sum is σ = 298932085920. Its totient is φ = 130208039136.

The previous prime is 201122122213. The next prime is 201122122247. The reversal of 201122122221 is 122221221102.

It is a happy number.

201122122221 is a `hidden beast` number, since 201 + 1 + 221 + 22 + 221 = 666.

It is not a de Polignac number, because 201122122221 - 2³ = 201122122213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201122122194 and 201122122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122122291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403251 + ... + 751568.

It is an arithmetic number, because the mean of its divisors is an integer number (12455503580).

Almost surely, 2^201122122221 is an apocalyptic number.

It is an amenable number.

201122122221 is a deficient number, since it is larger than the sum of its proper divisors (97809963699).

201122122221 is a wasteful number, since it uses less digits than its factorization.

201122122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155385 (or 1155382 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201122122221 its reverse (122221221102), we get a palindrome (323343343323).

The spelling of 201122122221 in words is "two hundred one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".