21163634130187 has 2 divisors, whose sum is σ = 21163634130188. Its totient is φ = 21163634130186.

The previous prime is 21163634130169. The next prime is 21163634130217. The reversal of 21163634130187 is 78103143636112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21163634130187 - 2⁷ = 21163634130059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21163634110187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581817065093 + 10581817065094.

It is an arithmetic number, because the mean of its divisors is an integer number (10581817065094).

Almost surely, 2^{21163634130187} is an apocalyptic number.

21163634130187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163634130187 is an equidigital number, since it uses as much as digits as its factorization.

21163634130187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

Adding to 21163634130187 its reverse (78103143636112), we get a palindrome (99266777766299).

The spelling of 21163634130187 in words is "twenty-one trillion, one hundred sixty-three billion, six hundred thirty-four million, one hundred thirty thousand, one hundred eighty-seven".