422043521 has 2 divisors, whose sum is σ = 422043522. Its totient is φ = 422043520.

The previous prime is 422043509. The next prime is 422043529. The reversal of 422043521 is 125340224.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319122496 + 102921025 = 17864^2 + 10145^2 .

It is a cyclic number.

It is not a de Polignac number, because 422043521 - 2¹⁸ = 421781377 is a prime.

It is not a weakly prime, because it can be changed into another prime (422043529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211021760 + 211021761.

It is an arithmetic number, because the mean of its divisors is an integer number (211021761).

Almost surely, 2^422043521 is an apocalyptic number.

It is an amenable number.

422043521 is a deficient number, since it is larger than the sum of its proper divisors (1).

422043521 is an equidigital number, since it uses as much as digits as its factorization.

422043521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 422043521 is about 20543.6978414306. The cubic root of 422043521 is about 750.0998510021.

Adding to 422043521 its reverse (125340224), we get a palindrome (547383745).

The spelling of 422043521 in words is "four hundred twenty-two million, forty-three thousand, five hundred twenty-one".