42007221 has 32 divisors (see below), whose sum is σ = 66873600. Its totient is φ = 25966080.

The previous prime is 42007171. The next prime is 42007243. The reversal of 42007221 is 12270024.

42007221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42007221 - 2⁹ = 42006709 is a prime.

It is a super-2 number, since 2×42007221² = 3529213232285682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42007194 and 42007203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42007291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31945 + ... + 33233.

It is an arithmetic number, because the mean of its divisors is an integer number (2089800).

Almost surely, 2^42007221 is an apocalyptic number.

It is an amenable number.

42007221 is a deficient number, since it is larger than the sum of its proper divisors (24866379).

42007221 is a wasteful number, since it uses less digits than its factorization.

42007221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1380 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 42007221 is about 6481.2977867091. The cubic root of 42007221 is about 347.6225842903.

Adding to 42007221 its reverse (12270024), we get a palindrome (54277245).

The spelling of 42007221 in words is "forty-two million, seven thousand, two hundred twenty-one".