63427516021 has 2 divisors, whose sum is σ = 63427516022. Its totient is φ = 63427516020.

The previous prime is 63427516013. The next prime is 63427516027. The reversal of 63427516021 is 12061572436.

63427516021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62744739121 + 682776900 = 250489^2 + 26130^2 .

It is a cyclic number.

It is not a de Polignac number, because 63427516021 - 2³ = 63427516013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63427516027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31713758010 + 31713758011.

It is an arithmetic number, because the mean of its divisors is an integer number (31713758011).

Almost surely, 2^63427516021 is an apocalyptic number.

It is an amenable number.

63427516021 is a deficient number, since it is larger than the sum of its proper divisors (1).

63427516021 is an equidigital number, since it uses as much as digits as its factorization.

63427516021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 63427516021 in words is "sixty-three billion, four hundred twenty-seven million, five hundred sixteen thousand, twenty-one".