16821330037 has 2 divisors, whose sum is σ = 16821330038. Its totient is φ = 16821330036.

The previous prime is 16821330023. The next prime is 16821330073. The reversal of 16821330037 is 73003312861.

Together with next prime (16821330073) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11527457956 + 5293872081 = 107366^2 + 72759^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821330037 - 2¹¹ = 16821327989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16821329984 and 16821330011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16821330007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410665018 + 8410665019.

It is an arithmetic number, because the mean of its divisors is an integer number (8410665019).

Almost surely, 2^16821330037 is an apocalyptic number.

It is an amenable number.

16821330037 is a deficient number, since it is larger than the sum of its proper divisors (1).

16821330037 is an equidigital number, since it uses as much as digits as its factorization.

16821330037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

Adding to 16821330037 its reverse (73003312861), we get a palindrome (89824642898).

The spelling of 16821330037 in words is "sixteen billion, eight hundred twenty-one million, three hundred thirty thousand, thirty-seven".