42145021 has 8 divisors (see below), whose sum is σ = 44553600. Its totient is φ = 39755520.

The previous prime is 42145009. The next prime is 42145063. The reversal of 42145021 is 12054124.

42145021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42145021 - 2¹⁷ = 42013949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42145021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42145001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (5569200).

Almost surely, 2^42145021 is an apocalyptic number.

It is an amenable number.

42145021 is a deficient number, since it is larger than the sum of its proper divisors (2408579).

42145021 is a wasteful number, since it uses less digits than its factorization.

42145021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9539.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42145021 is about 6491.9196698665. The cubic root of 42145021 is about 348.0022817704.

Adding to 42145021 its reverse (12054124), we get a palindrome (54199145).

The spelling of 42145021 in words is "forty-two million, one hundred forty-five thousand, twenty-one".