42003021 has 4 divisors (see below), whose sum is σ = 56004032. Its totient is φ = 28002012.

The previous prime is 42002999. The next prime is 42003023. The reversal of 42003021 is 12030024.

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 not a de Polignac number, because 42003021 - 2⁷ = 42002893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42002988 and 42003006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42003023) 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, 7000501 + ... + 7000506.

It is an arithmetic number, because the mean of its divisors is an integer number (14001008).

Almost surely, 2^42003021 is an apocalyptic number.

It is an amenable number.

42003021 is a deficient number, since it is larger than the sum of its proper divisors (14001011).

42003021 is a wasteful number, since it uses less digits than its factorization.

42003021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14001010.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 42003021 is about 6480.9737694269. The cubic root of 42003021 is about 347.6109984765.

Adding to 42003021 its reverse (12030024), we get a palindrome (54033045).

The spelling of 42003021 in words is "forty-two million, three thousand, twenty-one".