2011222021 has 2 divisors, whose sum is σ = 2011222022. Its totient is φ = 2011222020.

The previous prime is 2011222019. The next prime is 2011222039. The reversal of 2011222021 is 1202221102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1950988900 + 60233121 = 44170^2 + 7761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011222021 - 2¹ = 2011222019 is a prime.

Together with 2011222019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2011221992 and 2011222010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011222091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005611010 + 1005611011.

It is an arithmetic number, because the mean of its divisors is an integer number (1005611011).

Almost surely, 2^2011222021 is an apocalyptic number.

It is an amenable number.

2011222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011222021 is an equidigital number, since it uses as much as digits as its factorization.

2011222021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2011222021 is about 44846.6500532648. The cubic root of 2011222021 is about 1262.2731329240.

Adding to 2011222021 its reverse (1202221102), we get a palindrome (3213443123).

The spelling of 2011222021 in words is "two billion, eleven million, two hundred twenty-two thousand, twenty-one".