21919653887063 has 2 divisors, whose sum is σ = 21919653887064. Its totient is φ = 21919653887062.

The previous prime is 21919653887041. The next prime is 21919653887077. The reversal of 21919653887063 is 36078835691912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21919653887063 - 2³⁰ = 21918580145239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21919653886984 and 21919653887002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21919613887063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10959826943531 + 10959826943532.

It is an arithmetic number, because the mean of its divisors is an integer number (10959826943532).

Almost surely, 2^{21919653887063} is an apocalyptic number.

21919653887063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21919653887063 is an equidigital number, since it uses as much as digits as its factorization.

21919653887063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117573120, while the sum is 68.

The spelling of 21919653887063 in words is "twenty-one trillion, nine hundred nineteen billion, six hundred fifty-three million, eight hundred eighty-seven thousand, sixty-three".