21924749017 has 2 divisors, whose sum is σ = 21924749018. Its totient is φ = 21924749016.

The previous prime is 21924749009. The next prime is 21924749027. The reversal of 21924749017 is 71094742912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19857319056 + 2067429961 = 140916^2 + 45469^2 .

It is a cyclic number.

It is not a de Polignac number, because 21924749017 - 2³ = 21924749009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21924749027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962374508 + 10962374509.

It is an arithmetic number, because the mean of its divisors is an integer number (10962374509).

Almost surely, 2^21924749017 is an apocalyptic number.

It is an amenable number.

21924749017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924749017 is an equidigital number, since it uses as much as digits as its factorization.

21924749017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 21924749017 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-nine thousand, seventeen".