1266383828921 has 2 divisors, whose sum is σ = 1266383828922. Its totient is φ = 1266383828920.

The previous prime is 1266383828881. The next prime is 1266383828951. The reversal of 1266383828921 is 1298283836621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190359553296 + 76024275625 = 1091036^2 + 275725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266383828921 - 2¹⁰ = 1266383827897 is a prime.

It is a super-2 number, since 2×1266383828921² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1266383828951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633191914460 + 633191914461.

It is an arithmetic number, because the mean of its divisors is an integer number (633191914461).

Almost surely, 2^{1266383828921} is an apocalyptic number.

It is an amenable number.

1266383828921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266383828921 is an equidigital number, since it uses as much as digits as its factorization.

1266383828921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 59.

The spelling of 1266383828921 in words is "one trillion, two hundred sixty-six billion, three hundred eighty-three million, eight hundred twenty-eight thousand, nine hundred twenty-one".