42152321 has 2 divisors, whose sum is σ = 42152322. Its totient is φ = 42152320.

The previous prime is 42152293. The next prime is 42152323. The reversal of 42152321 is 12325124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 1690000 = 6361^2 + 1300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42152321 is a prime.

It is a Sophie Germain prime.

Together with 42152323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42152293 and 42152302.

It is not a weakly prime, because it can be changed into another prime (42152323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21076160 + 21076161.

It is an arithmetic number, because the mean of its divisors is an integer number (21076161).

Almost surely, 2^42152321 is an apocalyptic number.

It is an amenable number.

42152321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42152321 is an equidigital number, since it uses as much as digits as its factorization.

42152321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42152321 is about 6492.4818829166. The cubic root of 42152321 is about 348.0223732698.

Adding to 42152321 its reverse (12325124), we get a palindrome (54477445).

The spelling of 42152321 in words is "forty-two million, one hundred fifty-two thousand, three hundred twenty-one".