42212399 has 2 divisors, whose sum is σ = 42212400. Its totient is φ = 42212398.

The previous prime is 42212351. The next prime is 42212413. The reversal of 42212399 is 99321224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42212399 - 2⁸ = 42212143 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42212299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21106199 + 21106200.

It is an arithmetic number, because the mean of its divisors is an integer number (21106200).

Almost surely, 2^42212399 is an apocalyptic number.

42212399 is a deficient number, since it is larger than the sum of its proper divisors (1).

42212399 is an equidigital number, since it uses as much as digits as its factorization.

42212399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 42212399 is about 6497.1069715682. The cubic root of 42212399 is about 348.1876355232.

It can be divided in two parts, 422 and 12399, that added together give a palindrome (12821).

The spelling of 42212399 in words is "forty-two million, two hundred twelve thousand, three hundred ninety-nine".