16082091821 has 2 divisors, whose sum is σ = 16082091822. Its totient is φ = 16082091820.

The previous prime is 16082091797. The next prime is 16082091899. The reversal of 16082091821 is 12819028061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15891375721 + 190716100 = 126061^2 + 13810^2 .

It is a cyclic number.

It is not a de Polignac number, because 16082091821 - 2⁶ = 16082091757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16082091721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8041045910 + 8041045911.

It is an arithmetic number, because the mean of its divisors is an integer number (8041045911).

Almost surely, 2^16082091821 is an apocalyptic number.

It is an amenable number.

16082091821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16082091821 is an equidigital number, since it uses as much as digits as its factorization.

16082091821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 16082091821 in words is "sixteen billion, eighty-two million, ninety-one thousand, eight hundred twenty-one".