2011220221 has 4 divisors (see below), whose sum is σ = 2011409344. Its totient is φ = 2011031100.

The previous prime is 2011220219. The next prime is 2011220231. The reversal of 2011220221 is 1220221102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011220221 - 2¹ = 2011220219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011220231) by changing a digit.

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, 77595 + ... + 100216.

It is an arithmetic number, because the mean of its divisors is an integer number (502852336).

Almost surely, 2^2011220221 is an apocalyptic number.

It is an amenable number.

2011220221 is a deficient number, since it is larger than the sum of its proper divisors (189123).

2011220221 is a wasteful number, since it uses less digits than its factorization.

2011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189122.

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

The square root of 2011220221 is about 44846.6299848718. The cubic root of 2011220221 is about 1262.2727563549.

Adding to 2011220221 its reverse (1220221102), we get a palindrome (3231441323).

The spelling of 2011220221 in words is "two billion, eleven million, two hundred twenty thousand, two hundred twenty-one".