16723358221 has 2 divisors, whose sum is σ = 16723358222. Its totient is φ = 16723358220.

The previous prime is 16723358153. The next prime is 16723358237. The reversal of 16723358221 is 12285332761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14408401225 + 2314956996 = 120035^2 + 48114^2 .

It is a cyclic number.

It is not a de Polignac number, because 16723358221 - 2⁹ = 16723357709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16723358261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361679110 + 8361679111.

It is an arithmetic number, because the mean of its divisors is an integer number (8361679111).

Almost surely, 2^16723358221 is an apocalyptic number.

It is an amenable number.

16723358221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16723358221 is an equidigital number, since it uses as much as digits as its factorization.

16723358221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The spelling of 16723358221 in words is "sixteen billion, seven hundred twenty-three million, three hundred fifty-eight thousand, two hundred twenty-one".