2011002221 has 4 divisors (see below), whose sum is σ = 2011093344. Its totient is φ = 2010911100.

The previous prime is 2011002109. The next prime is 2011002239. The reversal of 2011002221 is 1222001102.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2011002221 - 2¹⁰ = 2011001197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011002421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10706 + ... + 64316.

It is an arithmetic number, because the mean of its divisors is an integer number (502773336).

Almost surely, 2^2011002221 is an apocalyptic number.

It is an amenable number.

2011002221 is a deficient number, since it is larger than the sum of its proper divisors (91123).

2011002221 is an equidigital number, since it uses as much as digits as its factorization.

2011002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91122.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2011002221 is about 44844.1994130791. The cubic root of 2011002221 is about 1262.2271479889.

Adding to 2011002221 its reverse (1222001102), we get a palindrome (3233003323).

The spelling of 2011002221 in words is "two billion, eleven million, two thousand, two hundred twenty-one".