11921800939 has 2 divisors, whose sum is σ = 11921800940. Its totient is φ = 11921800938.

The previous prime is 11921800927. The next prime is 11921800951. The reversal of 11921800939 is 93900812911.

It is a balanced prime because it is at equal distance from previous prime (11921800927) and next prime (11921800951).

It is a cyclic number.

It is not a de Polignac number, because 11921800939 - 2¹³ = 11921792747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11921800895 and 11921800904.

It is not a weakly prime, because it can be changed into another prime (11921800139) 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, 5960900469 + 5960900470.

It is an arithmetic number, because the mean of its divisors is an integer number (5960900470).

Almost surely, 2^11921800939 is an apocalyptic number.

11921800939 is a deficient number, since it is larger than the sum of its proper divisors (1).

11921800939 is an equidigital number, since it uses as much as digits as its factorization.

11921800939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The spelling of 11921800939 in words is "eleven billion, nine hundred twenty-one million, eight hundred thousand, nine hundred thirty-nine".