201122221220 has 12 divisors (see below), whose sum is σ = 422356664604. Its totient is φ = 80448888480.

The previous prime is 201122221207. The next prime is 201122221243. The reversal of 201122221220 is 22122221102.

It is a happy number.

201122221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 147546637924 + 53575583296 = 384118^2 + 231464^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5028055511 + ... + 5028055550.

It is an arithmetic number, because the mean of its divisors is an integer number (35196388717).

Almost surely, 2^201122221220 is an apocalyptic number.

201122221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201122221220 is an abundant number, since it is smaller than the sum of its proper divisors (221234443384).

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

201122221220 is a wasteful number, since it uses less digits than its factorization.

201122221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056111070 (or 10056111068 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 201122221220 its reverse (22122221102), we get a palindrome (223244442322).

The spelling of 201122221220 in words is "two hundred one billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".