2221112021 has 2 divisors, whose sum is σ = 2221112022. Its totient is φ = 2221112020.

The previous prime is 2221112009. The next prime is 2221112039. The reversal of 2221112021 is 1202111222.

2221112021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1302415921 + 918696100 = 36089^2 + 30310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221112021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221111987 and 2221112005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221112081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110556010 + 1110556011.

It is an arithmetic number, because the mean of its divisors is an integer number (1110556011).

Almost surely, 2^2221112021 is an apocalyptic number.

It is an amenable number.

2221112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221112021 is an equidigital number, since it uses as much as digits as its factorization.

2221112021 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 14.

The square root of 2221112021 is about 47128.6751458175. The cubic root of 2221112021 is about 1304.7385296481.

Adding to 2221112021 its reverse (1202111222), we get a palindrome (3423223243).

The spelling of 2221112021 in words is "two billion, two hundred twenty-one million, one hundred twelve thousand, twenty-one".