42536121 has 4 divisors (see below), whose sum is σ = 56714832. Its totient is φ = 28357412.

The previous prime is 42536111. The next prime is 42536129. The reversal of 42536121 is 12163524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42536121 - 2⁹ = 42535609 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42536091 and 42536100.

It is not an unprimeable number, because it can be changed into a prime (42536129) 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 in 3 ways as a sum of consecutive naturals, for example, 7089351 + ... + 7089356.

It is an arithmetic number, because the mean of its divisors is an integer number (14178708).

Almost surely, 2^42536121 is an apocalyptic number.

It is an amenable number.

42536121 is a deficient number, since it is larger than the sum of its proper divisors (14178711).

42536121 is a wasteful number, since it uses less digits than its factorization.

42536121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14178710.

The product of its digits is 1440, while the sum is 24.

The square root of 42536121 is about 6521.9721710538. The cubic root of 42536121 is about 349.0754401055.

Adding to 42536121 its reverse (12163524), we get a palindrome (54699645).

The spelling of 42536121 in words is "forty-two million, five hundred thirty-six thousand, one hundred twenty-one".