42410521 has 2 divisors, whose sum is σ = 42410522. Its totient is φ = 42410520.

The previous prime is 42410519. The next prime is 42410539. The reversal of 42410521 is 12501424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35462025 + 6948496 = 5955^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 42410521 - 2¹ = 42410519 is a prime.

Together with 42410519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42410581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21205260 + 21205261.

It is an arithmetic number, because the mean of its divisors is an integer number (21205261).

Almost surely, 2^42410521 is an apocalyptic number.

It is an amenable number.

42410521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42410521 is an equidigital number, since it uses as much as digits as its factorization.

42410521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42410521 is about 6512.3360631958. The cubic root of 42410521 is about 348.7315198560.

Adding to 42410521 its reverse (12501424), we get a palindrome (54911945).

The spelling of 42410521 in words is "forty-two million, four hundred ten thousand, five hundred twenty-one".