22223021 has 2 divisors, whose sum is σ = 22223022. Its totient is φ = 22223020.

The previous prime is 22223017. The next prime is 22223023. The reversal of 22223021 is 12032222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 1225 = 4714^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 22223021 - 2² = 22223017 is a prime.

It is a Sophie Germain prime.

Together with 22223023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22222987 and 22223005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22223023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111510 + 11111511.

It is an arithmetic number, because the mean of its divisors is an integer number (11111511).

Almost surely, 2^22223021 is an apocalyptic number.

It is an amenable number.

22223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22223021 is an equidigital number, since it uses as much as digits as its factorization.

22223021 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 14.

The square root of 22223021 is about 4714.1299303265. The cubic root of 22223021 is about 281.1475903032.

Adding to 22223021 its reverse (12032222), we get a palindrome (34255243).

The spelling of 22223021 in words is "twenty-two million, two hundred twenty-three thousand, twenty-one".