42113021 has 4 divisors (see below), whose sum is σ = 42126492. Its totient is φ = 42099552.

The previous prime is 42113009. The next prime is 42113047. The reversal of 42113021 is 12031124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26152996 + 15960025 = 5114^2 + 3995^2 .

It is a cyclic number.

It is not a de Polignac number, because 42113021 - 2⁶ = 42112957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42112987 and 42113005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42113521) 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, 665 + ... + 9201.

It is an arithmetic number, because the mean of its divisors is an integer number (10531623).

Almost surely, 2^42113021 is an apocalyptic number.

It is an amenable number.

42113021 is a deficient number, since it is larger than the sum of its proper divisors (13471).

42113021 is an equidigital number, since it uses as much as digits as its factorization.

42113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13470.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 42113021 is about 6489.4545995792. The cubic root of 42113021 is about 347.9141820580.

Adding to 42113021 its reverse (12031124), we get a palindrome (54144145).

The spelling of 42113021 in words is "forty-two million, one hundred thirteen thousand, twenty-one".