42521443 has 2 divisors, whose sum is σ = 42521444. Its totient is φ = 42521442.

The previous prime is 42521419. The next prime is 42521459. The reversal of 42521443 is 34412524.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42521443 - 2²¹ = 40424291 is a prime.

It is a super-2 number, since 2×42521443² = 3616146229604498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42521543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260721 + 21260722.

It is an arithmetic number, because the mean of its divisors is an integer number (21260722).

Almost surely, 2^42521443 is an apocalyptic number.

42521443 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521443 is an equidigital number, since it uses as much as digits as its factorization.

42521443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 25.

The square root of 42521443 is about 6520.8468008381. The cubic root of 42521443 is about 349.0352834994.

Adding to 42521443 its reverse (34412524), we get a palindrome (76933967).

The spelling of 42521443 in words is "forty-two million, five hundred twenty-one thousand, four hundred forty-three".