2011310221 has 4 divisors (see below), whose sum is σ = 2011938652. Its totient is φ = 2010681792.

The previous prime is 2011310209. The next prime is 2011310237. The reversal of 2011310221 is 1220131102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1826622121 + 184688100 = 42739^2 + 13590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011310221 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 (2011310281) 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, 309390 + ... + 315823.

It is an arithmetic number, because the mean of its divisors is an integer number (502984663).

Almost surely, 2^2011310221 is an apocalyptic number.

It is an amenable number.

2011310221 is a deficient number, since it is larger than the sum of its proper divisors (628431).

2011310221 is an equidigital number, since it uses as much as digits as its factorization.

2011310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628430.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2011310221 is about 44847.6333935248. The cubic root of 2011310221 is about 1262.2915845357.

Adding to 2011310221 its reverse (1220131102), we get a palindrome (3231441323).

The spelling of 2011310221 in words is "two billion, eleven million, three hundred ten thousand, two hundred twenty-one".