42521623 has 2 divisors, whose sum is σ = 42521624. Its totient is φ = 42521622.

The previous prime is 42521603. The next prime is 42521651. The reversal of 42521623 is 32612524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42521623 - 2⁹ = 42521111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42521603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260811 + 21260812.

It is an arithmetic number, because the mean of its divisors is an integer number (21260812).

Almost surely, 2^42521623 is an apocalyptic number.

42521623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521623 is an equidigital number, since it uses as much as digits as its factorization.

42521623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 42521623 is about 6520.8606027119. The cubic root of 42521623 is about 349.0357760059.

Subtracting from 42521623 its reverse (32612524), we obtain a palindrome (9909099).

The spelling of 42521623 in words is "forty-two million, five hundred twenty-one thousand, six hundred twenty-three".