21924748997 has 2 divisors, whose sum is σ = 21924748998. Its totient is φ = 21924748996.

The previous prime is 21924748991. The next prime is 21924749003. The reversal of 21924748997 is 79984742912.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21924748991) and next prime (21924749003).

It can be written as a sum of positive squares in only one way, i.e., 13967930596 + 7956818401 = 118186^2 + 89201^2 .

It is a cyclic number.

It is not a de Polignac number, because 21924748997 - 2²⁴ = 21907971781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21924748991) 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, 10962374498 + 10962374499.

It is an arithmetic number, because the mean of its divisors is an integer number (10962374499).

Almost surely, 2^21924748997 is an apocalyptic number.

It is an amenable number.

21924748997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924748997 is an equidigital number, since it uses as much as digits as its factorization.

21924748997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 62.

The spelling of 21924748997 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-eight thousand, nine hundred ninety-seven".