52542421 has 2 divisors, whose sum is σ = 52542422. Its totient is φ = 52542420.

The previous prime is 52542379. The next prime is 52542437. The reversal of 52542421 is 12424525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33524100 + 19018321 = 5790^2 + 4361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52542421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52542491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26271210 + 26271211.

It is an arithmetic number, because the mean of its divisors is an integer number (26271211).

Almost surely, 2^52542421 is an apocalyptic number.

It is an amenable number.

52542421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52542421 is an equidigital number, since it uses as much as digits as its factorization.

52542421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 25.

The square root of 52542421 is about 7248.6151091088. The cubic root of 52542421 is about 374.5444447351.

Adding to 52542421 its reverse (12424525), we get a palindrome (64966946).

The spelling of 52542421 in words is "fifty-two million, five hundred forty-two thousand, four hundred twenty-one".