52042421 has 2 divisors, whose sum is σ = 52042422. Its totient is φ = 52042420.

The previous prime is 52042409. The next prime is 52042439. The reversal of 52042421 is 12424025.

It is a happy number.

52042421 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., 52041796 + 625 = 7214^2 + 25^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52042421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52042393 and 52042402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52042481) 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, 26021210 + 26021211.

It is an arithmetic number, because the mean of its divisors is an integer number (26021211).

Almost surely, 2^52042421 is an apocalyptic number.

It is an amenable number.

52042421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52042421 is an equidigital number, since it uses as much as digits as its factorization.

52042421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 52042421 is about 7214.0433184172. The cubic root of 52042421 is about 373.3525860784.

Adding to 52042421 its reverse (12424025), we get a palindrome (64466446).

The spelling of 52042421 in words is "fifty-two million, forty-two thousand, four hundred twenty-one".