42220205 has 4 divisors (see below), whose sum is σ = 50664252. Its totient is φ = 33776160.

The previous prime is 42220177. The next prime is 42220229. The reversal of 42220205 is 50202224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9375844 + 32844361 = 3062^2 + 5731^2 .

It is not a de Polignac number, because 42220205 - 2⁸ = 42219949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4222016 + ... + 4222025.

It is an arithmetic number, because the mean of its divisors is an integer number (12666063).

Almost surely, 2^42220205 is an apocalyptic number.

It is an amenable number.

42220205 is a deficient number, since it is larger than the sum of its proper divisors (8444047).

42220205 is an equidigital number, since it uses as much as digits as its factorization.

42220205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8444046.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 42220205 is about 6497.7076727104. The cubic root of 42220205 is about 348.2090967149.

Adding to 42220205 its reverse (50202224), we get a palindrome (92422429).

The spelling of 42220205 in words is "forty-two million, two hundred twenty thousand, two hundred five".