21919675823 has 2 divisors, whose sum is σ = 21919675824. Its totient is φ = 21919675822.

The previous prime is 21919675759. The next prime is 21919675879. The reversal of 21919675823 is 32857691912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21919675823 - 2⁶ = 21919675759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21919675423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10959837911 + 10959837912.

It is an arithmetic number, because the mean of its divisors is an integer number (10959837912).

Almost surely, 2^21919675823 is an apocalyptic number.

21919675823 is a deficient number, since it is larger than the sum of its proper divisors (1).

21919675823 is an equidigital number, since it uses as much as digits as its factorization.

21919675823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The spelling of 21919675823 in words is "twenty-one billion, nine hundred nineteen million, six hundred seventy-five thousand, eight hundred twenty-three".