42427321 has 2 divisors, whose sum is σ = 42427322. Its totient is φ = 42427320.

The previous prime is 42427243. The next prime is 42427331. The reversal of 42427321 is 12372424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 436921 = 6480^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 42427321 - 2⁹ = 42426809 is a prime.

It is not a weakly prime, because it can be changed into another prime (42427331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21213660 + 21213661.

It is an arithmetic number, because the mean of its divisors is an integer number (21213661).

Almost surely, 2^42427321 is an apocalyptic number.

It is an amenable number.

42427321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42427321 is an equidigital number, since it uses as much as digits as its factorization.

42427321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 25.

The square root of 42427321 is about 6513.6257952081. The cubic root of 42427321 is about 348.7775612310. Note that the first 3 decimals are identical.

Adding to 42427321 its reverse (12372424), we get a palindrome (54799745).

The spelling of 42427321 in words is "forty-two million, four hundred twenty-seven thousand, three hundred twenty-one".