21163316346647 has 4 divisors (see below), whose sum is σ = 21163405628160. Its totient is φ = 21163227065136.

The previous prime is 21163316346593. The next prime is 21163316346703. The reversal of 21163316346647 is 74664361336112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21163316346647 - 2⁶ = 21163316346583 is a prime.

It is a super-2 number, since 2×21163316346647² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163316346247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44284247 + ... + 44759592.

It is an arithmetic number, because the mean of its divisors is an integer number (5290851407040).

Almost surely, 2^{21163316346647} is an apocalyptic number.

21163316346647 is a deficient number, since it is larger than the sum of its proper divisors (89281513).

21163316346647 is an equidigital number, since it uses as much as digits as its factorization.

21163316346647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89281512.

The product of its digits is 7838208, while the sum is 53.

The spelling of 21163316346647 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, three hundred forty-six thousand, six hundred forty-seven".