42110521 has 4 divisors (see below), whose sum is σ = 42278544. Its totient is φ = 41942500.

The previous prime is 42110507. The next prime is 42110569. The reversal of 42110521 is 12501124.

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 42110521 - 2⁵ = 42110489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42110495 and 42110504.

It is not an unprimeable number, because it can be changed into a prime (42113521) 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, 83635 + ... + 84136.

It is an arithmetic number, because the mean of its divisors is an integer number (10569636).

Almost surely, 2^42110521 is an apocalyptic number.

It is an amenable number.

42110521 is a deficient number, since it is larger than the sum of its proper divisors (168023).

42110521 is a wasteful number, since it uses less digits than its factorization.

42110521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168022.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 42110521 is about 6489.2619765271. The cubic root of 42110521 is about 347.9072973887.

Adding to 42110521 its reverse (12501124), we get a palindrome (54611645).

The spelling of 42110521 in words is "forty-two million, one hundred ten thousand, five hundred twenty-one".