2011322221 has 2 divisors, whose sum is σ = 2011322222. Its totient is φ = 2011322220.

The previous prime is 2011322189. The next prime is 2011322237. The reversal of 2011322221 is 1222231102.

It is a happy number.

It is an a-pointer prime, because the next prime (2011322237) can be obtained adding 2011322221 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1026241225 + 985080996 = 32035^2 + 31386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011322221 - 2⁵ = 2011322189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2011322195 and 2011322204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011322321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005661110 + 1005661111.

It is an arithmetic number, because the mean of its divisors is an integer number (1005661111).

Almost surely, 2^2011322221 is an apocalyptic number.

It is an amenable number.

2011322221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011322221 is an equidigital number, since it uses as much as digits as its factorization.

2011322221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2011322221 is about 44847.7671796490. The cubic root of 2011322221 is about 1262.2940949173.

Adding to 2011322221 its reverse (1222231102), we get a palindrome (3233553323).

The spelling of 2011322221 in words is "two billion, eleven million, three hundred twenty-two thousand, two hundred twenty-one".