6536532421 has 2 divisors, whose sum is σ = 6536532422. Its totient is φ = 6536532420.

The previous prime is 6536532389. The next prime is 6536532433. The reversal of 6536532421 is 1242356356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5151650625 + 1384881796 = 71775^2 + 37214^2 .

It is a cyclic number.

It is not a de Polignac number, because 6536532421 - 2⁵ = 6536532389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6536532721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3268266210 + 3268266211.

It is an arithmetic number, because the mean of its divisors is an integer number (3268266211).

Almost surely, 2^6536532421 is an apocalyptic number.

It is an amenable number.

6536532421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6536532421 is an equidigital number, since it uses as much as digits as its factorization.

6536532421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 37.

The square root of 6536532421 is about 80848.8244874346. The cubic root of 6536532421 is about 1869.7453990074.

Adding to 6536532421 its reverse (1242356356), we get a palindrome (7778888777).

The spelling of 6536532421 in words is "six billion, five hundred thirty-six million, five hundred thirty-two thousand, four hundred twenty-one".