1081168108021 has 4 divisors (see below), whose sum is σ = 1083665032492. Its totient is φ = 1078671183552.

The previous prime is 1081168107997. The next prime is 1081168108037. The reversal of 1081168108021 is 1208018611801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78826739121 + 1002341368900 = 280761^2 + 1001170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081168108021 - 2¹¹ = 1081168105973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081138108021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248461586 + ... + 1248462451.

It is an arithmetic number, because the mean of its divisors is an integer number (270916258123).

Almost surely, 2^{1081168108021} is an apocalyptic number.

It is an amenable number.

1081168108021 is a deficient number, since it is larger than the sum of its proper divisors (2496924471).

1081168108021 is an equidigital number, since it uses as much as digits as its factorization.

1081168108021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496924470.

The product of its (nonzero) digits is 6144, while the sum is 37.

The spelling of 1081168108021 in words is "one trillion, eighty-one billion, one hundred sixty-eight million, one hundred eight thousand, twenty-one".