42566421 has 8 divisors (see below), whose sum is σ = 56862304. Its totient is φ = 28324080.

The previous prime is 42566411. The next prime is 42566429. The reversal of 42566421 is 12466524.

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

It is not a de Polignac number, because 42566421 - 2⁵ = 42566389 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 (42566429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11491 + ... + 14736.

It is an arithmetic number, because the mean of its divisors is an integer number (7107788).

Almost surely, 2^42566421 is an apocalyptic number.

It is an amenable number.

42566421 is a deficient number, since it is larger than the sum of its proper divisors (14295883).

42566421 is a wasteful number, since it uses less digits than its factorization.

42566421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26771.

The product of its digits is 11520, while the sum is 30.

The square root of 42566421 is about 6524.2946745223. The cubic root of 42566421 is about 349.1583067384.

The spelling of 42566421 in words is "forty-two million, five hundred sixty-six thousand, four hundred twenty-one".