42215443 has 2 divisors, whose sum is σ = 42215444. Its totient is φ = 42215442.

The previous prime is 42215441. The next prime is 42215449. The reversal of 42215443 is 34451224.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42215443 - 2¹ = 42215441 is a prime.

Together with 42215441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42215441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107721 + 21107722.

It is an arithmetic number, because the mean of its divisors is an integer number (21107722).

Almost surely, 2^42215443 is an apocalyptic number.

42215443 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215443 is an equidigital number, since it uses as much as digits as its factorization.

42215443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 25.

The square root of 42215443 is about 6497.3412254552. The cubic root of 42215443 is about 348.1960047678.

Adding to 42215443 its reverse (34451224), we get a palindrome (76666667).

The spelling of 42215443 in words is "forty-two million, two hundred fifteen thousand, four hundred forty-three".