6486421021 has 2 divisors, whose sum is σ = 6486421022. Its totient is φ = 6486421020.

The previous prime is 6486421013. The next prime is 6486421079. The reversal of 6486421021 is 1201246846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5125844025 + 1360576996 = 71595^2 + 36886^2 .

It is a cyclic number.

It is not a de Polignac number, because 6486421021 - 2³ = 6486421013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6486427021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3243210510 + 3243210511.

It is an arithmetic number, because the mean of its divisors is an integer number (3243210511).

Almost surely, 2^6486421021 is an apocalyptic number.

It is an amenable number.

6486421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6486421021 is an equidigital number, since it uses as much as digits as its factorization.

6486421021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 6486421021 is about 80538.3202022491. The cubic root of 6486421021 is about 1864.9550905721.

Adding to 6486421021 its reverse (1201246846), we get a palindrome (7687667867).

The spelling of 6486421021 in words is "six billion, four hundred eighty-six million, four hundred twenty-one thousand, twenty-one".