16721456343 has 16 divisors (see below), whose sum is σ = 24633144576. Its totient is φ = 10035724160.

The previous prime is 16721456317. The next prime is 16721456357. The reversal of 16721456343 is 34365412761.

It is a cyclic number.

It is not a de Polignac number, because 16721456343 - 2¹⁸ = 16721194199 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 16721456295 and 16721456304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721456363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7126473 + ... + 7128818.

It is an arithmetic number, because the mean of its divisors is an integer number (1539571536).

Almost surely, 2^16721456343 is an apocalyptic number.

16721456343 is a deficient number, since it is larger than the sum of its proper divisors (7911688233).

16721456343 is a wasteful number, since it uses less digits than its factorization.

16721456343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14255334.

The product of its digits is 362880, while the sum is 42.

The spelling of 16721456343 in words is "sixteen billion, seven hundred twenty-one million, four hundred fifty-six thousand, three hundred forty-three".