8432111921 has 2 divisors, whose sum is σ = 8432111922. Its totient is φ = 8432111920.

The previous prime is 8432111887. The next prime is 8432111969. The reversal of 8432111921 is 1291112348.

8432111921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5755498225 + 2676613696 = 75865^2 + 51736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8432111921 is a prime.

It is a super-2 number, since 2×8432111921² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8432111981) 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, 4216055960 + 4216055961.

It is an arithmetic number, because the mean of its divisors is an integer number (4216055961).

Almost surely, 2^8432111921 is an apocalyptic number.

It is an amenable number.

8432111921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8432111921 is an equidigital number, since it uses as much as digits as its factorization.

8432111921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 8432111921 is about 91826.5316833866. The cubic root of 8432111921 is about 2035.3797721238.

The spelling of 8432111921 in words is "eight billion, four hundred thirty-two million, one hundred eleven thousand, nine hundred twenty-one".