2221223021 has 2 divisors, whose sum is σ = 2221223022. Its totient is φ = 2221223020.

The previous prime is 2221223003. The next prime is 2221223023. The reversal of 2221223021 is 1203221222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243972900 + 977250121 = 35270^2 + 31261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221223021 - 2¹⁸ = 2220960877 is a prime.

Together with 2221223023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221223023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110611510 + 1110611511.

It is an arithmetic number, because the mean of its divisors is an integer number (1110611511).

Almost surely, 2^2221223021 is an apocalyptic number.

It is an amenable number.

2221223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221223021 is an equidigital number, since it uses as much as digits as its factorization.

2221223021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2221223021 is about 47129.8527580980. The cubic root of 2221223021 is about 1304.7602640411.

Adding to 2221223021 its reverse (1203221222), we get a palindrome (3424444243).

The spelling of 2221223021 in words is "two billion, two hundred twenty-one million, two hundred twenty-three thousand, twenty-one".