7116776921 has 2 divisors, whose sum is σ = 7116776922. Its totient is φ = 7116776920.

The previous prime is 7116776911. The next prime is 7116776941. The reversal of 7116776921 is 1296776117.

7116776921 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., 7110705625 + 6071296 = 84325^2 + 2464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7116776921 is a prime.

It is not a weakly prime, because it can be changed into another prime (7116776911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3558388460 + 3558388461.

It is an arithmetic number, because the mean of its divisors is an integer number (3558388461).

Almost surely, 2^7116776921 is an apocalyptic number.

It is an amenable number.

7116776921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7116776921 is an equidigital number, since it uses as much as digits as its factorization.

7116776921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 47.

The square root of 7116776921 is about 84360.9917023265. The cubic root of 7116776921 is about 1923.5100109896.

The spelling of 7116776921 in words is "seven billion, one hundred sixteen million, seven hundred seventy-six thousand, nine hundred twenty-one".