422127521 has 2 divisors, whose sum is σ = 422127522. Its totient is φ = 422127520.

The previous prime is 422127491. The next prime is 422127523. The reversal of 422127521 is 125721224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412293025 + 9834496 = 20305^2 + 3136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422127521 is a prime.

Together with 422127523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (422127523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211063760 + 211063761.

It is an arithmetic number, because the mean of its divisors is an integer number (211063761).

Almost surely, 2^422127521 is an apocalyptic number.

It is an amenable number.

422127521 is a deficient number, since it is larger than the sum of its proper divisors (1).

422127521 is an equidigital number, since it uses as much as digits as its factorization.

422127521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 26.

The square root of 422127521 is about 20545.7421623070. The cubic root of 422127521 is about 750.1496122270.

Adding to 422127521 its reverse (125721224), we get a palindrome (547848745).

The spelling of 422127521 in words is "four hundred twenty-two million, one hundred twenty-seven thousand, five hundred twenty-one".