16821926935361 has 4 divisors (see below), whose sum is σ = 17139321783252. Its totient is φ = 16504532087472.

The previous prime is 16821926935357. The next prime is 16821926935369. The reversal of 16821926935361 is 16353962912861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15455905960000 + 1366020975361 = 3931400^2 + 1168769^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821926935361 - 2² = 16821926935357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16821926935294 and 16821926935303.

It is not an unprimeable number, because it can be changed into a prime (16821926935369) 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, 158697423866 + ... + 158697423971.

It is an arithmetic number, because the mean of its divisors is an integer number (4284830445813).

Almost surely, 2^{16821926935361} is an apocalyptic number.

It is an amenable number.

16821926935361 is a deficient number, since it is larger than the sum of its proper divisors (317394847891).

16821926935361 is an equidigital number, since it uses as much as digits as its factorization.

16821926935361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317394847890.

The product of its digits is 25194240, while the sum is 62.

The spelling of 16821926935361 in words is "sixteen trillion, eight hundred twenty-one billion, nine hundred twenty-six million, nine hundred thirty-five thousand, three hundred sixty-one".