42221243 has 2 divisors, whose sum is σ = 42221244. Its totient is φ = 42221242.

The previous prime is 42221239. The next prime is 42221269. The reversal of 42221243 is 34212224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42221243 - 2² = 42221239 is a prime.

It is a Sophie Germain prime.

It is equal to p_2560250 and since 42221243 and 2560250 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110621 + 21110622.

It is an arithmetic number, because the mean of its divisors is an integer number (21110622).

Almost surely, 2^42221243 is an apocalyptic number.

42221243 is a deficient number, since it is larger than the sum of its proper divisors (1).

42221243 is an equidigital number, since it uses as much as digits as its factorization.

42221243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 20.

The square root of 42221243 is about 6497.7875465423. The cubic root of 42221243 is about 348.2119503097.

Adding to 42221243 its reverse (34212224), we get a palindrome (76433467).

The spelling of 42221243 in words is "forty-two million, two hundred twenty-one thousand, two hundred forty-three".