42043213 has 4 divisors (see below), whose sum is σ = 42732508. Its totient is φ = 41353920.

The previous prime is 42043201. The next prime is 42043217. The reversal of 42043213 is 31234024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1108809 + 40934404 = 1053^2 + 6398^2 .

It is a cyclic number.

It is not a de Polignac number, because 42043213 - 2²¹ = 39946061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42043217) 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, 344556 + ... + 344677.

It is an arithmetic number, because the mean of its divisors is an integer number (10683127).

Almost surely, 2^42043213 is an apocalyptic number.

It is an amenable number.

42043213 is a deficient number, since it is larger than the sum of its proper divisors (689295).

42043213 is an equidigital number, since it uses as much as digits as its factorization.

42043213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689294.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42043213 is about 6484.0737966189. The cubic root of 42043213 is about 347.7218375465.

Adding to 42043213 its reverse (31234024), we get a palindrome (73277237).

The spelling of 42043213 in words is "forty-two million, forty-three thousand, two hundred thirteen".