42021804 has 24 divisors (see below), whose sum is σ = 106964928. Its totient is φ = 12733840.

The previous prime is 42021803. The next prime is 42021817. The reversal of 42021804 is 40812024.

It is a super-2 number, since 2×42021804² = 3531664022828832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42021803) 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 7 ways as a sum of consecutive naturals, for example, 159042 + ... + 159305.

It is an arithmetic number, because the mean of its divisors is an integer number (4456872).

Almost surely, 2^42021804 is an apocalyptic number.

42021804 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

42021804 is an abundant number, since it is smaller than the sum of its proper divisors (64943124).

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

42021804 is a wasteful number, since it uses less digits than its factorization.

42021804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318365 (or 318363 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 42021804 is about 6482.4226952583. The cubic root of 42021804 is about 347.6628058960.

Adding to 42021804 its reverse (40812024), we get a palindrome (82833828).

It can be divided in two parts, 4202 and 1804, that added together give a palindrome (6006).

The spelling of 42021804 in words is "forty-two million, twenty-one thousand, eight hundred four".