1326118021 has 2 divisors, whose sum is σ = 1326118022. Its totient is φ = 1326118020.

The previous prime is 1326118009. The next prime is 1326118037. The reversal of 1326118021 is 1208116231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736308225 + 589809796 = 27135^2 + 24286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326118021 - 2²⁵ = 1292563589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1326118051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663059010 + 663059011.

It is an arithmetic number, because the mean of its divisors is an integer number (663059011).

Almost surely, 2^1326118021 is an apocalyptic number.

It is an amenable number.

1326118021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326118021 is an equidigital number, since it uses as much as digits as its factorization.

1326118021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1326118021 is about 36415.9034077146. The cubic root of 1326118021 is about 1098.6534545267.

The spelling of 1326118021 in words is "one billion, three hundred twenty-six million, one hundred eighteen thousand, twenty-one".