21924795917 has 2 divisors, whose sum is σ = 21924795918. Its totient is φ = 21924795916.

The previous prime is 21924795883. The next prime is 21924795929. The reversal of 21924795917 is 71959742912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14577906121 + 7346889796 = 120739^2 + 85714^2 .

It is a cyclic number.

It is not a de Polignac number, because 21924795917 - 2²⁶ = 21857687053 is a prime.

It is a super-3 number, since 3×21924795917³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21924795017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962397958 + 10962397959.

It is an arithmetic number, because the mean of its divisors is an integer number (10962397959).

Almost surely, 2^21924795917 is an apocalyptic number.

It is an amenable number.

21924795917 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924795917 is an equidigital number, since it uses as much as digits as its factorization.

21924795917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 56.

The spelling of 21924795917 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred ninety-five thousand, nine hundred seventeen".