42223221 has 16 divisors (see below), whose sum is σ = 63131200. Its totient is φ = 27888624.

The previous prime is 42223213. The next prime is 42223229. The reversal of 42223221 is 12232224.

42223221 is a `hidden beast` number, since 422 + 23 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (42223213) and next prime (42223229).

It is not a de Polignac number, because 42223221 - 2³ = 42223213 is a prime.

It is a super-2 number, since 2×42223221² = 3565600783229682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42223194 and 42223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42223229) 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 15 ways as a sum of consecutive naturals, for example, 4231 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (3945700).

Almost surely, 2^42223221 is an apocalyptic number.

It is an amenable number.

42223221 is a deficient number, since it is larger than the sum of its proper divisors (20907979).

42223221 is a wasteful number, since it uses less digits than its factorization.

42223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14465 (or 14459 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 42223221 is about 6497.9397504132. The cubic root of 42223221 is about 348.2173879555.

Adding to 42223221 its reverse (12232224), we get a palindrome (54455445).

The spelling of 42223221 in words is "forty-two million, two hundred twenty-three thousand, two hundred twenty-one".