422247521 has 2 divisors, whose sum is σ = 422247522. Its totient is φ = 422247520.

The previous prime is 422247457. The next prime is 422247541. The reversal of 422247521 is 125742224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325441600 + 96805921 = 18040^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 422247521 - 2⁶ = 422247457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (422247541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211123760 + 211123761.

It is an arithmetic number, because the mean of its divisors is an integer number (211123761).

Almost surely, 2^422247521 is an apocalyptic number.

It is an amenable number.

422247521 is a deficient number, since it is larger than the sum of its proper divisors (1).

422247521 is an equidigital number, since it uses as much as digits as its factorization.

422247521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 29.

The square root of 422247521 is about 20548.6622678947. The cubic root of 422247521 is about 750.2206882411.

Adding to 422247521 its reverse (125742224), we get a palindrome (547989745).

The spelling of 422247521 in words is "four hundred twenty-two million, two hundred forty-seven thousand, five hundred twenty-one".