2321381720817 has 8 divisors (see below), whose sum is σ = 3439084030880. Its totient is φ = 1547587813860.

The previous prime is 2321381720803. The next prime is 2321381720899. The reversal of 2321381720817 is 7180271831232.

2321381720817 is a `hidden beast` number, since 232 + 1 + 381 + 7 + 20 + 8 + 17 = 666.

It is not a de Polignac number, because 2321381720817 - 2¹⁹ = 2321381196529 is a prime.

It is a super-2 number, since 2×2321381720817² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2321381720417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42988550359 + ... + 42988550412.

It is an arithmetic number, because the mean of its divisors is an integer number (429885503860).

Almost surely, 2^{2321381720817} is an apocalyptic number.

2321381720817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2321381720817 is a deficient number, since it is larger than the sum of its proper divisors (1117702310063).

2321381720817 is an equidigital number, since it uses as much as digits as its factorization.

2321381720817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85977100780 (or 85977100774 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 2321381720817 in words is "two trillion, three hundred twenty-one billion, three hundred eighty-one million, seven hundred twenty thousand, eight hundred seventeen".