42341021 has 2 divisors, whose sum is σ = 42341022. Its totient is φ = 42341020.

The previous prime is 42341003. The next prime is 42341023. The reversal of 42341021 is 12014324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 2524921 = 6310^2 + 1589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42341021 is a prime.

It is a Sophie Germain prime.

Together with 42341023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42341023) 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, 21170510 + 21170511.

It is an arithmetic number, because the mean of its divisors is an integer number (21170511).

Almost surely, 2^42341021 is an apocalyptic number.

It is an amenable number.

42341021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42341021 is an equidigital number, since it uses as much as digits as its factorization.

42341021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 42341021 is about 6506.9978484705. The cubic root of 42341021 is about 348.5409217728.

Adding to 42341021 its reverse (12014324), we get a palindrome (54355345).

The spelling of 42341021 in words is "forty-two million, three hundred forty-one thousand, twenty-one".