42351221 has 16 divisors (see below), whose sum is σ = 47096640. Its totient is φ = 37764480.

The previous prime is 42351193. The next prime is 42351227. The reversal of 42351221 is 12215324.

42351221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42351221 - 2¹⁰ = 42350197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42351193 and 42351202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42351227) 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 15 ways as a sum of consecutive naturals, for example, 236510 + ... + 236688.

It is an arithmetic number, because the mean of its divisors is an integer number (2943540).

Almost surely, 2^42351221 is an apocalyptic number.

It is an amenable number.

42351221 is a deficient number, since it is larger than the sum of its proper divisors (4745419).

42351221 is a wasteful number, since it uses less digits than its factorization.

42351221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484.

The product of its digits is 480, while the sum is 20.

The square root of 42351221 is about 6507.7815728557. The cubic root of 42351221 is about 348.5689074935.

Adding to 42351221 its reverse (12215324), we get a palindrome (54566545).

The spelling of 42351221 in words is "forty-two million, three hundred fifty-one thousand, two hundred twenty-one".