8827917821 has 2 divisors, whose sum is σ = 8827917822. Its totient is φ = 8827917820.

The previous prime is 8827917817. The next prime is 8827917853. The reversal of 8827917821 is 1287197288.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7003346596 + 1824571225 = 83686^2 + 42715^2 .

It is a cyclic number.

It is not a de Polignac number, because 8827917821 - 2² = 8827917817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8827917121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4413958910 + 4413958911.

It is an arithmetic number, because the mean of its divisors is an integer number (4413958911).

Almost surely, 2^8827917821 is an apocalyptic number.

It is an amenable number.

8827917821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8827917821 is an equidigital number, since it uses as much as digits as its factorization.

8827917821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 53.

The square root of 8827917821 is about 93956.9998509957. Note that the first 3 decimals coincide. The cubic root of 8827917821 is about 2066.7411846382.

The spelling of 8827917821 in words is "eight billion, eight hundred twenty-seven million, nine hundred seventeen thousand, eight hundred twenty-one".