42420043541 has 2 divisors, whose sum is σ = 42420043542. Its totient is φ = 42420043540.

The previous prime is 42420043517. The next prime is 42420043559. The reversal of 42420043541 is 14534002424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42002862916 + 417180625 = 204946^2 + 20425^2 .

It is a cyclic number.

It is not a de Polignac number, because 42420043541 - 2²² = 42415849237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42420013541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210021770 + 21210021771.

It is an arithmetic number, because the mean of its divisors is an integer number (21210021771).

Almost surely, 2^42420043541 is an apocalyptic number.

It is an amenable number.

42420043541 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420043541 is an equidigital number, since it uses as much as digits as its factorization.

42420043541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 42420043541 its reverse (14534002424), we get a palindrome (56954045965).

The spelling of 42420043541 in words is "forty-two billion, four hundred twenty million, forty-three thousand, five hundred forty-one".