2011000221 has 24 divisors (see below), whose sum is σ = 3010001280. Its totient is φ = 1292893056.

The previous prime is 2011000207. The next prime is 2011000247. The reversal of 2011000221 is 1220001102.

It is not a de Polignac number, because 2011000221 - 2²⁶ = 1943891357 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011000291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2316 + ... + 63461.

It is an arithmetic number, because the mean of its divisors is an integer number (125416720).

Almost surely, 2^2011000221 is an apocalyptic number.

It is an amenable number.

2011000221 is a deficient number, since it is larger than the sum of its proper divisors (999001059).

2011000221 is a wasteful number, since it uses less digits than its factorization.

2011000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65905 (or 65902 counting only the distinct ones).

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

The square root of 2011000221 is about 44844.1771136454. The cubic root of 2011000221 is about 1262.2267295483.

Adding to 2011000221 its reverse (1220001102), we get a palindrome (3231001323).

The spelling of 2011000221 in words is "two billion, eleven million, two hundred twenty-one", and thus it is an aban number.