16829743621 has 2 divisors, whose sum is σ = 16829743622. Its totient is φ = 16829743620.

The previous prime is 16829743613. The next prime is 16829743661. The reversal of 16829743621 is 12634792861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16314952900 + 514790721 = 127730^2 + 22689^2 .

It is a cyclic number.

It is not a de Polignac number, because 16829743621 - 2³ = 16829743613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16829743661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8414871810 + 8414871811.

It is an arithmetic number, because the mean of its divisors is an integer number (8414871811).

Almost surely, 2^16829743621 is an apocalyptic number.

It is an amenable number.

16829743621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16829743621 is an equidigital number, since it uses as much as digits as its factorization.

16829743621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The spelling of 16829743621 in words is "sixteen billion, eight hundred twenty-nine million, seven hundred forty-three thousand, six hundred twenty-one".