1021116857 has 2 divisors, whose sum is σ = 1021116858. Its totient is φ = 1021116856.

The previous prime is 1021116839. The next prime is 1021116871. The reversal of 1021116857 is 7586111201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 785064361 + 236052496 = 28019^2 + 15364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021116857 - 2¹⁰ = 1021115833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021112857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510558428 + 510558429.

It is an arithmetic number, because the mean of its divisors is an integer number (510558429).

Almost surely, 2^1021116857 is an apocalyptic number.

It is an amenable number.

1021116857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021116857 is an equidigital number, since it uses as much as digits as its factorization.

1021116857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 32.

The square root of 1021116857 is about 31954.9191361831. The cubic root of 1021116857 is about 1006.9899786883.

The spelling of 1021116857 in words is "one billion, twenty-one million, one hundred sixteen thousand, eight hundred fifty-seven".