42120523 has 2 divisors, whose sum is σ = 42120524. Its totient is φ = 42120522.

The previous prime is 42120517. The next prime is 42120563. The reversal of 42120523 is 32502124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42120523 - 2¹³ = 42112331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42120523.

It is not a weakly prime, because it can be changed into another prime (42120563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060261 + 21060262.

It is an arithmetic number, because the mean of its divisors is an integer number (21060262).

Almost surely, 2^42120523 is an apocalyptic number.

42120523 is a deficient number, since it is larger than the sum of its proper divisors (1).

42120523 is an equidigital number, since it uses as much as digits as its factorization.

42120523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 42120523 is about 6490.0325885160. The cubic root of 42120523 is about 347.9348399382.

Adding to 42120523 its reverse (32502124), we get a palindrome (74622647).

The spelling of 42120523 in words is "forty-two million, one hundred twenty thousand, five hundred twenty-three".