42521603 has 2 divisors, whose sum is σ = 42521604. Its totient is φ = 42521602.

The previous prime is 42521597. The next prime is 42521623. The reversal of 42521603 is 30612524.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42521603 is a prime.

It is not a weakly prime, because it can be changed into another prime (42521623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260801 + 21260802.

It is an arithmetic number, because the mean of its divisors is an integer number (21260802).

Almost surely, 2^42521603 is an apocalyptic number.

42521603 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521603 is an equidigital number, since it uses as much as digits as its factorization.

42521603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 42521603 is about 6520.8590691718. The cubic root of 42521603 is about 349.0357212830.

The spelling of 42521603 in words is "forty-two million, five hundred twenty-one thousand, six hundred three".