201100122220 has 24 divisors (see below), whose sum is σ = 423751600944. Its totient is φ = 80165507136.

The previous prime is 201100122163. The next prime is 201100122229. The reversal of 201100122220 is 22221001102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 201100122220.

It is not an unprimeable number, because it can be changed into a prime (201100122229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17152854 + ... + 17164573.

It is an arithmetic number, because the mean of its divisors is an integer number (17656316706).

Almost surely, 2^201100122220 is an apocalyptic number.

201100122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201100122220 is an abundant number, since it is smaller than the sum of its proper divisors (222651478724).

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

201100122220 is a wasteful number, since it uses less digits than its factorization.

201100122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34317729 (or 34317727 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201100122220 its reverse (22221001102), we get a palindrome (223321123322).

The spelling of 201100122220 in words is "two hundred one billion, one hundred million, one hundred twenty-two thousand, two hundred twenty".