8120988854621 has 2 divisors, whose sum is σ = 8120988854622. Its totient is φ = 8120988854620.

The previous prime is 8120988854599. The next prime is 8120988854633. The reversal of 8120988854621 is 1264588890218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5967828811396 + 2153160043225 = 2442914^2 + 1467365^2 .

It is a cyclic number.

It is not a de Polignac number, because 8120988854621 - 2¹⁰ = 8120988853597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8120988854681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060494427310 + 4060494427311.

It is an arithmetic number, because the mean of its divisors is an integer number (4060494427311).

Almost surely, 2^{8120988854621} is an apocalyptic number.

It is an amenable number.

8120988854621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8120988854621 is an equidigital number, since it uses as much as digits as its factorization.

8120988854621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17694720, while the sum is 62.

The spelling of 8120988854621 in words is "eight trillion, one hundred twenty billion, nine hundred eighty-eight million, eight hundred fifty-four thousand, six hundred twenty-one".