42022221 has 4 divisors (see below), whose sum is σ = 56029632. Its totient is φ = 28014812.

The previous prime is 42022207. The next prime is 42022241. The reversal of 42022221 is 12222024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42022221 - 2⁷ = 42022093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42022241) 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 3 ways as a sum of consecutive naturals, for example, 7003701 + ... + 7003706.

It is an arithmetic number, because the mean of its divisors is an integer number (14007408).

Almost surely, 2^42022221 is an apocalyptic number.

It is an amenable number.

42022221 is a deficient number, since it is larger than the sum of its proper divisors (14007411).

42022221 is a wasteful number, since it uses less digits than its factorization.

42022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14007410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 42022221 is about 6482.4548590792. The cubic root of 42022221 is about 347.6639558935.

Adding to 42022221 its reverse (12222024), we get a palindrome (54244245).

The spelling of 42022221 in words is "forty-two million, twenty-two thousand, two hundred twenty-one".