42011021 has 16 divisors (see below), whose sum is σ = 46833024. Its totient is φ = 37433664.

The previous prime is 42011017. The next prime is 42011083. The reversal of 42011021 is 12011024.

It is a cyclic number.

It is not a de Polignac number, because 42011021 - 2² = 42011017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42010993 and 42011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42011521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80066 + ... + 80588.

It is an arithmetic number, because the mean of its divisors is an integer number (2927064).

Almost surely, 2^42011021 is an apocalyptic number.

It is an amenable number.

42011021 is a deficient number, since it is larger than the sum of its proper divisors (4822003).

42011021 is a wasteful number, since it uses less digits than its factorization.

42011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 42011021 is about 6481.5909312452. The cubic root of 42011021 is about 347.6330660278.

Adding to 42011021 its reverse (12011024), we get a palindrome (54022045).

The spelling of 42011021 in words is "forty-two million, eleven thousand, twenty-one".