9999921939037 has 2 divisors, whose sum is σ = 9999921939038. Its totient is φ = 9999921939036.

The previous prime is 9999921939017. The next prime is 9999921939071. The reversal of 9999921939037 is 7309391299999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9703137780196 + 296784158841 = 3114986^2 + 544779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999921939037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999921939017) 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, 4999960969518 + 4999960969519.

It is an arithmetic number, because the mean of its divisors is an integer number (4999960969519).

Almost surely, 2^{9999921939037} is an apocalyptic number.

It is an amenable number.

9999921939037 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999921939037 is an equidigital number, since it uses as much as digits as its factorization.

9999921939037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602654094, while the sum is 79.

The spelling of 9999921939037 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred twenty-one million, nine hundred thirty-nine thousand, thirty-seven".