21744704417629 has 2 divisors, whose sum is σ = 21744704417630. Its totient is φ = 21744704417628.

The previous prime is 21744704417621. The next prime is 21744704417647. The reversal of 21744704417629 is 92671440744712.

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., 17922327509529 + 3822376908100 = 4233477^2 + 1955090^2 .

It is a cyclic number.

It is not a de Polignac number, because 21744704417629 - 2³ = 21744704417621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21744704417621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10872352208814 + 10872352208815.

It is an arithmetic number, because the mean of its divisors is an integer number (10872352208815).

Almost surely, 2^{21744704417629} is an apocalyptic number.

It is an amenable number.

21744704417629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21744704417629 is an equidigital number, since it uses as much as digits as its factorization.

21744704417629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18966528, while the sum is 58.

The spelling of 21744704417629 in words is "twenty-one trillion, seven hundred forty-four billion, seven hundred four million, four hundred seventeen thousand, six hundred twenty-nine".