12071821691 has 2 divisors, whose sum is σ = 12071821692. Its totient is φ = 12071821690.

The previous prime is 12071821679. The next prime is 12071821709. The reversal of 12071821691 is 19612817021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12071821691 - 2¹⁴ = 12071805307 is a prime.

It is not a weakly prime, because it can be changed into another prime (12071821621) 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, 6035910845 + 6035910846.

It is an arithmetic number, because the mean of its divisors is an integer number (6035910846).

Almost surely, 2^12071821691 is an apocalyptic number.

12071821691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12071821691 is an equidigital number, since it uses as much as digits as its factorization.

12071821691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 38.

The spelling of 12071821691 in words is "twelve billion, seventy-one million, eight hundred twenty-one thousand, six hundred ninety-one".