2011243221 has 48 divisors (see below), whose sum is σ = 3191431152. Its totient is φ = 1213056000.

The previous prime is 2011243219. The next prime is 2011243231. The reversal of 2011243221 is 1223421102.

It is a happy number.

2011243221 is a `hidden beast` number, since 201 + 1 + 243 + 221 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1184048100 + 827195121 = 34410^2 + 28761^2 .

It is not a de Polignac number, because 2011243221 - 2¹ = 2011243219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2011243194 and 2011243203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011243231) 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 47 ways as a sum of consecutive naturals, for example, 1545271 + ... + 1546571.

It is an arithmetic number, because the mean of its divisors is an integer number (66488149).

Almost surely, 2^2011243221 is an apocalyptic number.

It is an amenable number.

2011243221 is a deficient number, since it is larger than the sum of its proper divisors (1180187931).

2011243221 is a wasteful number, since it uses less digits than its factorization.

2011243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2011243221 is about 44846.8864136631. The cubic root of 2011243221 is about 1262.2775680545.

Adding to 2011243221 its reverse (1223421102), we get a palindrome (3234664323).

The spelling of 2011243221 in words is "two billion, eleven million, two hundred forty-three thousand, two hundred twenty-one".