21491176892063 has 2 divisors, whose sum is σ = 21491176892064. Its totient is φ = 21491176892062.

The previous prime is 21491176891991. The next prime is 21491176892113. The reversal of 21491176892063 is 36029867119412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21491176892063 - 2⁴² = 17093130380959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21491176891993 and 21491176892011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21491176894063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10745588446031 + 10745588446032.

It is an arithmetic number, because the mean of its divisors is an integer number (10745588446032).

Almost surely, 2^{21491176892063} is an apocalyptic number.

21491176892063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21491176892063 is an equidigital number, since it uses as much as digits as its factorization.

21491176892063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 21491176892063 in words is "twenty-one trillion, four hundred ninety-one billion, one hundred seventy-six million, eight hundred ninety-two thousand, sixty-three".