42321919 has 2 divisors, whose sum is σ = 42321920. Its totient is φ = 42321918.

The previous prime is 42321907. The next prime is 42321943. The reversal of 42321919 is 91912324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42321919 - 2¹⁷ = 42190847 is a prime.

It is a super-2 number, since 2×42321919² = 3582289655685122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42321319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160959 + 21160960.

It is an arithmetic number, because the mean of its divisors is an integer number (21160960).

Almost surely, 2^42321919 is an apocalyptic number.

42321919 is a deficient number, since it is larger than the sum of its proper divisors (1).

42321919 is an equidigital number, since it uses as much as digits as its factorization.

42321919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 42321919 is about 6505.5298784957. The cubic root of 42321919 is about 348.4884995591.

The spelling of 42321919 in words is "forty-two million, three hundred twenty-one thousand, nine hundred nineteen".