1166421060821 has 2 divisors, whose sum is σ = 1166421060822. Its totient is φ = 1166421060820.

The previous prime is 1166421060817. The next prime is 1166421060853. The reversal of 1166421060821 is 1280601246611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140013185796 + 26407875025 = 1067714^2 + 162505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166421060821 - 2² = 1166421060817 is a prime.

It is a super-2 number, since 2×1166421060821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166421060221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583210530410 + 583210530411.

It is an arithmetic number, because the mean of its divisors is an integer number (583210530411).

Almost surely, 2^{1166421060821} is an apocalyptic number.

It is an amenable number.

1166421060821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166421060821 is an equidigital number, since it uses as much as digits as its factorization.

1166421060821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 1166421060821 in words is "one trillion, one hundred sixty-six billion, four hundred twenty-one million, sixty thousand, eight hundred twenty-one".