1091199021013 has 4 divisors (see below), whose sum is σ = 1097227745068. Its totient is φ = 1085170296960.

The previous prime is 1091199020993. The next prime is 1091199021023. The reversal of 1091199021013 is 3101209911901.

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 250982964324 + 840216056689 = 500982^2 + 916633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091199021013 - 2³³ = 1082609086421 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 (1091199021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3014361756 + ... + 3014362117.

It is an arithmetic number, because the mean of its divisors is an integer number (274306936267).

Almost surely, 2^{1091199021013} is an apocalyptic number.

It is an amenable number.

1091199021013 is a deficient number, since it is larger than the sum of its proper divisors (6028724055).

1091199021013 is an equidigital number, since it uses as much as digits as its factorization.

1091199021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028724054.

The product of its (nonzero) digits is 4374, while the sum is 37.

The spelling of 1091199021013 in words is "one trillion, ninety-one billion, one hundred ninety-nine million, twenty-one thousand, thirteen".