42021340 has 12 divisors (see below), whose sum is σ = 88244856. Its totient is φ = 16808528.

The previous prime is 42021313. The next prime is 42021341. The reversal of 42021340 is 4312024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021341) 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, 1050514 + ... + 1050553.

It is an arithmetic number, because the mean of its divisors is an integer number (7353738).

Almost surely, 2^42021340 is an apocalyptic number.

It is an amenable number.

42021340 is an abundant number, since it is smaller than the sum of its proper divisors (46223516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42021340 is a wasteful number, since it uses less digits than its factorization.

42021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101076 (or 2101074 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42021340 is about 6482.3869060709. The cubic root of 42021340 is about 347.6615262735.

Adding to 42021340 its reverse (4312024), we get a palindrome (46333364).

The spelling of 42021340 in words is "forty-two million, twenty-one thousand, three hundred forty".