201220011 has 16 divisors (see below), whose sum is σ = 301456800. Its totient is φ = 132637824.

The previous prime is 201219917. The next prime is 201220043. The reversal of 201220011 is 110022102.

It is not a de Polignac number, because 201220011 - 2¹³ = 201211819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 201219975 and 201220002.

It is not an unprimeable number, because it can be changed into a prime (201220711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39466 + ... + 44271.

It is an arithmetic number, because the mean of its divisors is an integer number (18841050).

Almost surely, 2^201220011 is an apocalyptic number.

201220011 is a deficient number, since it is larger than the sum of its proper divisors (100236789).

201220011 is an equidigital number, since it uses as much as digits as its factorization.

201220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83835 (or 83829 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 201220011 is about 14185.2039463661. The cubic root of 201220011 is about 585.9902491903.

Adding to 201220011 its reverse (110022102), we get a palindrome (311242113).

The spelling of 201220011 in words is "two hundred one million, two hundred twenty thousand, eleven".