42245221 has 8 divisors (see below), whose sum is σ = 45771264. Its totient is φ = 38834880.

The previous prime is 42245179. The next prime is 42245237. The reversal of 42245221 is 12254224.

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 42245221 - 2¹⁹ = 41720933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42245192 and 42245201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42245251) 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 7 ways as a sum of consecutive naturals, for example, 28165 + ... + 29626.

It is an arithmetic number, because the mean of its divisors is an integer number (5721408).

Almost surely, 2^42245221 is an apocalyptic number.

It is an amenable number.

42245221 is a deficient number, since it is larger than the sum of its proper divisors (3526043).

42245221 is a wasteful number, since it uses less digits than its factorization.

42245221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57851.

The product of its digits is 1280, while the sum is 22.

The square root of 42245221 is about 6499.6323742193. The cubic root of 42245221 is about 348.2778558861.

Adding to 42245221 its reverse (12254224), we get a palindrome (54499445).

The spelling of 42245221 in words is "forty-two million, two hundred forty-five thousand, two hundred twenty-one".