21724336311005 has 8 divisors (see below), whose sum is σ = 26069536953312. Its totient is φ = 17379246795408.

The previous prime is 21724336310987. The next prime is 21724336311101. The reversal of 21724336311005 is 50011363342712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21724336311005 - 2⁸ = 21724336310749 is a prime.

It is a super-2 number, since 2×21724336311005² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21724336311005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27350987 + ... + 28134056.

It is an arithmetic number, because the mean of its divisors is an integer number (3258692119164).

Almost surely, 2^{21724336311005} is an apocalyptic number.

It is an amenable number.

21724336311005 is a deficient number, since it is larger than the sum of its proper divisors (4345200642307).

21724336311005 is an equidigital number, since it uses as much as digits as its factorization.

21724336311005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55563355.

The product of its (nonzero) digits is 90720, while the sum is 38.

Adding to 21724336311005 its reverse (50011363342712), we get a palindrome (71735699653717).

The spelling of 21724336311005 in words is "twenty-one trillion, seven hundred twenty-four billion, three hundred thirty-six million, three hundred eleven thousand, five".