42354421 has 2 divisors, whose sum is σ = 42354422. Its totient is φ = 42354420.

The previous prime is 42354419. The next prime is 42354427. The reversal of 42354421 is 12445324.

It is a happy number.

42354421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42068196 + 286225 = 6486^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 42354421 - 2¹ = 42354419 is a prime.

Together with 42354419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42354427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21177210 + 21177211.

It is an arithmetic number, because the mean of its divisors is an integer number (21177211).

Almost surely, 2^42354421 is an apocalyptic number.

It is an amenable number.

42354421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42354421 is an equidigital number, since it uses as much as digits as its factorization.

42354421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42354421 is about 6508.0274277234. The cubic root of 42354421 is about 348.5776864015.

Adding to 42354421 its reverse (12445324), we get a palindrome (54799745).

The spelling of 42354421 in words is "forty-two million, three hundred fifty-four thousand, four hundred twenty-one".