9712921811 has 2 divisors, whose sum is σ = 9712921812. Its totient is φ = 9712921810.

The previous prime is 9712921759. The next prime is 9712921859. The reversal of 9712921811 is 1181292179.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9712921811 - 2²⁶ = 9645812947 is a prime.

It is not a weakly prime, because it can be changed into another prime (9712921871) 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, 4856460905 + 4856460906.

It is an arithmetic number, because the mean of its divisors is an integer number (4856460906).

Almost surely, 2^9712921811 is an apocalyptic number.

9712921811 is a deficient number, since it is larger than the sum of its proper divisors (1).

9712921811 is an equidigital number, since it uses as much as digits as its factorization.

9712921811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 41.

The square root of 9712921811 is about 98554.1567413572. The cubic root of 9712921811 is about 2133.6178247362.

The spelling of 9712921811 in words is "nine billion, seven hundred twelve million, nine hundred twenty-one thousand, eight hundred eleven".