39194068736821 has 2 divisors, whose sum is σ = 39194068736822. Its totient is φ = 39194068736820.

The previous prime is 39194068736699. The next prime is 39194068736833. The reversal of 39194068736821 is 12863786049193.

39194068736821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20170078014321 + 19023990722500 = 4491111^2 + 4361650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39194068736821 is a prime.

It is a super-2 number, since 2×39194068736821² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39194068736891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19597034368410 + 19597034368411.

It is an arithmetic number, because the mean of its divisors is an integer number (19597034368411).

Almost surely, 2^{39194068736821} is an apocalyptic number.

It is an amenable number.

39194068736821 is a deficient number, since it is larger than the sum of its proper divisors (1).

39194068736821 is an equidigital number, since it uses as much as digits as its factorization.

39194068736821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 39194068736821 in words is "thirty-nine trillion, one hundred ninety-four billion, sixty-eight million, seven hundred thirty-six thousand, eight hundred twenty-one".