1168821821 has 2 divisors, whose sum is σ = 1168821822. Its totient is φ = 1168821820.

The previous prime is 1168821763. The next prime is 1168821833. The reversal of 1168821821 is 1281288611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1066022500 + 102799321 = 32650^2 + 10139^2 .

It is an emirp because it is prime and its reverse (1281288611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1168821821 - 2²⁶ = 1101712957 is a prime.

It is a super-2 number, since 2×1168821821² = 2732288898491512082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1168821851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 584410910 + 584410911.

It is an arithmetic number, because the mean of its divisors is an integer number (584410911).

Almost surely, 2^1168821821 is an apocalyptic number.

It is an amenable number.

1168821821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1168821821 is an equidigital number, since it uses as much as digits as its factorization.

1168821821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 38.

The square root of 1168821821 is about 34188.0362261420. The cubic root of 1168821821 is about 1053.3744260950.

The spelling of 1168821821 in words is "one billion, one hundred sixty-eight million, eight hundred twenty-one thousand, eight hundred twenty-one".