201111220 has 24 divisors (see below), whose sum is σ = 428639904. Its totient is φ = 79243296.

The previous prime is 201111217. The next prime is 201111221. The reversal of 201111220 is 22111102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 201111197 and 201111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111221) 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, 73702 + ... + 76381.

It is an arithmetic number, because the mean of its divisors is an integer number (17859996).

Almost surely, 2^201111220 is an apocalyptic number.

201111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201111220 is an abundant number, since it is smaller than the sum of its proper divisors (227528684).

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

201111220 is a wasteful number, since it uses less digits than its factorization.

201111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150159 (or 150157 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 201111220 is about 14181.3687632753. The cubic root of 201111220 is about 585.8846235828.

Adding to 201111220 its reverse (22111102), we get a palindrome (223222322).

It can be divided in two parts, 2011 and 11220, that added together give a palindrome (13231).

The spelling of 201111220 in words is "two hundred one million, one hundred eleven thousand, two hundred twenty".