16334610221 has 2 divisors, whose sum is σ = 16334610222. Its totient is φ = 16334610220.

The previous prime is 16334610217. The next prime is 16334610287. The reversal of 16334610221 is 12201643361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12554082025 + 3780528196 = 112045^2 + 61486^2 .

It is a cyclic number.

It is not a de Polignac number, because 16334610221 - 2² = 16334610217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16334610121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8167305110 + 8167305111.

It is an arithmetic number, because the mean of its divisors is an integer number (8167305111).

Almost surely, 2^16334610221 is an apocalyptic number.

It is an amenable number.

16334610221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16334610221 is an equidigital number, since it uses as much as digits as its factorization.

16334610221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 16334610221 in words is "sixteen billion, three hundred thirty-four million, six hundred ten thousand, two hundred twenty-one".