42005221 has 8 divisors (see below), whose sum is σ = 42910560. Its totient is φ = 41109552.

The previous prime is 42005209. The next prime is 42005237. The reversal of 42005221 is 12250024.

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

It is a cyclic number.

It is not a de Polignac number, because 42005221 - 2⁵ = 42005189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42005195 and 42005204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42009221) 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, 6726 + ... + 11368.

It is an arithmetic number, because the mean of its divisors is an integer number (5363820).

Almost surely, 2^42005221 is an apocalyptic number.

It is an amenable number.

42005221 is a deficient number, since it is larger than the sum of its proper divisors (905339).

42005221 is a wasteful number, since it uses less digits than its factorization.

42005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 42005221 is about 6481.1434947855. The cubic root of 42005221 is about 347.6170673324.

Adding to 42005221 its reverse (12250024), we get a palindrome (54255245).

The spelling of 42005221 in words is "forty-two million, five thousand, two hundred twenty-one".