42304821 has 16 divisors (see below), whose sum is σ = 60975936. Its totient is φ = 25934976.

The previous prime is 42304817. The next prime is 42304861. The reversal of 42304821 is 12840324.

It is not a de Polignac number, because 42304821 - 2² = 42304817 is a prime.

It is a super-4 number, since 4×42304821⁴ (a number of 32 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42304791 and 42304800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42304861) 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 15 ways as a sum of consecutive naturals, for example, 9121 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (3810996).

Almost surely, 2^42304821 is an apocalyptic number.

It is an amenable number.

42304821 is a deficient number, since it is larger than the sum of its proper divisors (18671115).

42304821 is a wasteful number, since it uses less digits than its factorization.

42304821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 42304821 is about 6504.2156329568. The cubic root of 42304821 is about 348.4415636049.

The spelling of 42304821 in words is "forty-two million, three hundred four thousand, eight hundred twenty-one".