42223021 has 2 divisors, whose sum is σ = 42223022. Its totient is φ = 42223020.

The previous prime is 42223007. The next prime is 42223037. The reversal of 42223021 is 12032224.

It is an a-pointer prime, because the next prime (42223037) can be obtained adding 42223021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32046921 + 10176100 = 5661^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 42223021 - 2¹⁹ = 41698733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42222986 and 42223004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42223081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21111510 + 21111511.

It is an arithmetic number, because the mean of its divisors is an integer number (21111511).

Almost surely, 2^42223021 is an apocalyptic number.

It is an amenable number.

42223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42223021 is an equidigital number, since it uses as much as digits as its factorization.

42223021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42223021 is about 6497.9243609017. The cubic root of 42223021 is about 348.2168381507.

Adding to 42223021 its reverse (12032224), we get a palindrome (54255245).

The spelling of 42223021 in words is "forty-two million, two hundred twenty-three thousand, twenty-one".