1091940221093 has 8 divisors (see below), whose sum is σ = 1112606632728. Its totient is φ = 1071276171264.

The previous prime is 1091940221063. The next prime is 1091940221171. The reversal of 1091940221093 is 3901220491901.

It can be written as a sum of positive squares in 4 ways, for example, as 282600686404 + 809339534689 = 531602^2 + 899633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1091940221093 - 2¹⁰ = 1091940220069 is a prime.

It is a super-2 number, since 2×1091940221093² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091940221093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091940221063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357221 + ... + 1520357.

It is an arithmetic number, because the mean of its divisors is an integer number (139075829091).

Almost surely, 2^{1091940221093} is an apocalyptic number.

It is an amenable number.

1091940221093 is a deficient number, since it is larger than the sum of its proper divisors (20666411635).

1091940221093 is a wasteful number, since it uses less digits than its factorization.

1091940221093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180903.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 1091940221093 in words is "one trillion, ninety-one billion, nine hundred forty million, two hundred twenty-one thousand, ninety-three".