201221221122 has 24 divisors (see below), whose sum is σ = 436442664060. Its totient is φ = 67002455520.

The previous prime is 201221221111. The next prime is 201221221129. The reversal of 201221221122 is 221122122102.

It is a happy number.

201221221122 is a `hidden beast` number, since 201 + 221 + 221 + 1 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 173231596521 + 27989624601 = 416211^2 + 167301^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201221221095 and 201221221104.

It is not an unprimeable number, because it can be changed into a prime (201221221129) 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, 5922997 + ... + 5956872.

Almost surely, 2^201221221122 is an apocalyptic number.

201221221122 is an abundant number, since it is smaller than the sum of its proper divisors (235221442938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201221221122 is a wasteful number, since it uses less digits than its factorization.

201221221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11880818 (or 11880815 counting only the distinct ones).

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

Adding to 201221221122 its reverse (221122122102), we get a palindrome (422343343224).

The spelling of 201221221122 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".