21924749009 has 2 divisors, whose sum is σ = 21924749010. Its totient is φ = 21924749008.

The previous prime is 21924749003. The next prime is 21924749017. The reversal of 21924749009 is 90094742912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20207475409 + 1717273600 = 142153^2 + 41440^2 .

It is a cyclic number.

It is not a de Polignac number, because 21924749009 - 2⁸ = 21924748753 is a prime.

It is not a weakly prime, because it can be changed into another prime (21924749003) 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, 10962374504 + 10962374505.

It is an arithmetic number, because the mean of its divisors is an integer number (10962374505).

Almost surely, 2^21924749009 is an apocalyptic number.

It is an amenable number.

21924749009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924749009 is an equidigital number, since it uses as much as digits as its factorization.

21924749009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 21924749009 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-nine thousand, nine".