42021013 has 4 divisors (see below), whose sum is σ = 42429088. Its totient is φ = 41612940.

The previous prime is 42020983. The next prime is 42021017. The reversal of 42021013 is 31012024.

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 42021013 - 2¹³ = 42012821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42020984 and 42021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021017) 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, 203883 + ... + 204088.

It is an arithmetic number, because the mean of its divisors is an integer number (10607272).

Almost surely, 2^42021013 is an apocalyptic number.

It is an amenable number.

42021013 is a deficient number, since it is larger than the sum of its proper divisors (408075).

42021013 is a wasteful number, since it uses less digits than its factorization.

42021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408074.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 42021013 is about 6482.3616838310. The cubic root of 42021013 is about 347.6606244649.

Adding to 42021013 its reverse (31012024), we get a palindrome (73033037).

The spelling of 42021013 in words is "forty-two million, twenty-one thousand, thirteen".