2011312221 has 8 divisors (see below), whose sum is σ = 2683146144. Its totient is φ = 1340176560.

The previous prime is 2011312201. The next prime is 2011312231. The reversal of 2011312221 is 1222131102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2011312221 - 2⁵ = 2011312189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2011312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011312201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167806 + ... + 179391.

It is an arithmetic number, because the mean of its divisors is an integer number (335393268).

Almost surely, 2^2011312221 is an apocalyptic number.

It is an amenable number.

2011312221 is a deficient number, since it is larger than the sum of its proper divisors (671833923).

2011312221 is a wasteful number, since it uses less digits than its factorization.

2011312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349131.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2011312221 is about 44847.6556912399. The cubic root of 2011312221 is about 1262.2920029333.

Adding to 2011312221 its reverse (1222131102), we get a palindrome (3233443323).

The spelling of 2011312221 in words is "two billion, eleven million, three hundred twelve thousand, two hundred twenty-one".