16821415213 has 2 divisors, whose sum is σ = 16821415214. Its totient is φ = 16821415212.

The previous prime is 16821415189. The next prime is 16821415279. The reversal of 16821415213 is 31251412861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14400480004 + 2420935209 = 120002^2 + 49203^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821415213 - 2⁵ = 16821415181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16821410213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410707606 + 8410707607.

It is an arithmetic number, because the mean of its divisors is an integer number (8410707607).

Almost surely, 2^16821415213 is an apocalyptic number.

It is an amenable number.

16821415213 is a deficient number, since it is larger than the sum of its proper divisors (1).

16821415213 is an equidigital number, since it uses as much as digits as its factorization.

16821415213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The spelling of 16821415213 in words is "sixteen billion, eight hundred twenty-one million, four hundred fifteen thousand, two hundred thirteen".