42584021 has 4 divisors (see below), whose sum is σ = 43490112. Its totient is φ = 41677932.

The previous prime is 42583991. The next prime is 42584057. The reversal of 42584021 is 12048524.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 42584021 - 2¹⁰ = 42582997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42584821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452975 + ... + 453068.

It is an arithmetic number, because the mean of its divisors is an integer number (10872528).

Almost surely, 2^42584021 is an apocalyptic number.

It is an amenable number.

42584021 is a deficient number, since it is larger than the sum of its proper divisors (906091).

42584021 is an equidigital number, since it uses as much as digits as its factorization.

42584021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906090.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 42584021 is about 6525.6433399321. The cubic root of 42584021 is about 349.2064224385.

The spelling of 42584021 in words is "forty-two million, five hundred eighty-four thousand, twenty-one".