42021513 has 12 divisors (see below), whose sum is σ = 60823620. Its totient is φ = 27956256.

The previous prime is 42021509. The next prime is 42021517. The reversal of 42021513 is 31512024.

It is an interprime number because it is at equal distance from previous prime (42021509) and next prime (42021517).

It can be written as a sum of positive squares in 2 ways, for example, as 15116544 + 26904969 = 3888^2 + 5187^2 .

It is not a de Polignac number, because 42021513 - 2² = 42021509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42021517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6 + ... + 9167.

It is an arithmetic number, because the mean of its divisors is an integer number (5068635).

Almost surely, 2^42021513 is an apocalyptic number.

It is an amenable number.

42021513 is a deficient number, since it is larger than the sum of its proper divisors (18802107).

42021513 is a wasteful number, since it uses less digits than its factorization.

42021513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9688 (or 9685 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42021513 is about 6482.4002499074. The cubic root of 42021513 is about 347.6620033752.

Adding to 42021513 its reverse (31512024), we get a palindrome (73533537).

The spelling of 42021513 in words is "forty-two million, twenty-one thousand, five hundred thirteen".