201122222121 has 12 divisors (see below), whose sum is σ = 298361495172. Its totient is φ = 130457657376.

The previous prime is 201122222111. The next prime is 201122222123. The reversal of 201122222121 is 121222221102.

It is a happy number.

201122222121 is a `hidden beast` number, since 201 + 1 + 222 + 221 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 165701100096 + 35421122025 = 407064^2 + 188205^2 .

It is not a de Polignac number, because 201122222121 - 2⁵ = 201122222089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201122222094 and 201122222103.

It is not an unprimeable number, because it can be changed into a prime (201122222123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301984986 + ... + 301985651.

It is an arithmetic number, because the mean of its divisors is an integer number (24863457931).

Almost surely, 2^201122222121 is an apocalyptic number.

It is an amenable number.

201122222121 is a deficient number, since it is larger than the sum of its proper divisors (97239273051).

201122222121 is a wasteful number, since it uses less digits than its factorization.

201122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603970680 (or 603970677 counting only the distinct ones).

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

Adding to 201122222121 its reverse (121222221102), we get a palindrome (322344443223).

The spelling of 201122222121 in words is "two hundred one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".