222223021 has 2 divisors, whose sum is σ = 222223022. Its totient is φ = 222223020.

The previous prime is 222223007. The next prime is 222223049. The reversal of 222223021 is 120322222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 107433225 = 10714^2 + 10365^2 .

It is a cyclic number.

It is not a de Polignac number, because 222223021 - 2²¹ = 220125869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222222986 and 222223004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222223081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111111510 + 111111511.

It is an arithmetic number, because the mean of its divisors is an integer number (111111511).

Almost surely, 2^222223021 is an apocalyptic number.

It is an amenable number.

222223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222223021 is an equidigital number, since it uses as much as digits as its factorization.

222223021 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 16.

The square root of 222223021 is about 14907.1466417957. The cubic root of 222223021 is about 605.7075900143.

Adding to 222223021 its reverse (120322222), we get a palindrome (342545243).

The spelling of 222223021 in words is "two hundred twenty-two million, two hundred twenty-three thousand, twenty-one".