42421523 has 4 divisors (see below), whose sum is σ = 42478320. Its totient is φ = 42364728.

The previous prime is 42421493. The next prime is 42421553. The reversal of 42421523 is 32512424.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42421493) and next prime (42421553).

It is a cyclic number.

It is not a de Polignac number, because 42421523 - 2⁶ = 42421459 is a prime.

It is a super-2 number, since 2×42421523² = 3599171227279058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42421553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27263 + ... + 28776.

It is an arithmetic number, because the mean of its divisors is an integer number (10619580).

Almost surely, 2^42421523 is an apocalyptic number.

42421523 is a deficient number, since it is larger than the sum of its proper divisors (56797).

42421523 is an equidigital number, since it uses as much as digits as its factorization.

42421523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56796.

The product of its digits is 1920, while the sum is 23.

The square root of 42421523 is about 6513.1807129850. The cubic root of 42421523 is about 348.7616728492.

Adding to 42421523 its reverse (32512424), we get a palindrome (74933947).

Subtracting from 42421523 its reverse (32512424), we obtain a palindrome (9909099).

The spelling of 42421523 in words is "forty-two million, four hundred twenty-one thousand, five hundred twenty-three".