63108860021 has 2 divisors, whose sum is σ = 63108860022. Its totient is φ = 63108860020.

The previous prime is 63108859997. The next prime is 63108860027. The reversal of 63108860021 is 12006880136.

63108860021 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., 35830704100 + 27278155921 = 189290^2 + 165161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63108860021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63108860027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31554430010 + 31554430011.

It is an arithmetic number, because the mean of its divisors is an integer number (31554430011).

Almost surely, 2^63108860021 is an apocalyptic number.

It is an amenable number.

63108860021 is a deficient number, since it is larger than the sum of its proper divisors (1).

63108860021 is an equidigital number, since it uses as much as digits as its factorization.

63108860021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 63108860021 in words is "sixty-three billion, one hundred eight million, eight hundred sixty thousand, twenty-one".