201111201220 has 24 divisors (see below), whose sum is σ = 447176671704. Its totient is φ = 75712452096.

The previous prime is 201111201199. The next prime is 201111201257. The reversal of 201111201220 is 22102111102.

201111201220 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 4 ways, for example, as 104055275776 + 97055925444 = 322576^2 + 311538^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 201111201220.

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 7 ways as a sum of consecutive naturals, for example, 295751427 + ... + 295752106.

It is an arithmetic number, because the mean of its divisors is an integer number (18632361321).

Almost surely, 2^201111201220 is an apocalyptic number.

201111201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201111201220 is an abundant number, since it is smaller than the sum of its proper divisors (246065470484).

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

201111201220 is a wasteful number, since it uses less digits than its factorization.

201111201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591503559 (or 591503557 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201111201220 its reverse (22102111102), we get a palindrome (223213312322).

The spelling of 201111201220 in words is "two hundred one billion, one hundred eleven million, two hundred one thousand, two hundred twenty".