1191140821005 has 16 divisors (see below), whose sum is σ = 1937068353024. Its totient is φ = 624860758080.

The previous prime is 1191140821001. The next prime is 1191140821009. The reversal of 1191140821005 is 5001280411911.

It is an interprime number because it is at equal distance from previous prime (1191140821001) and next prime (1191140821009).

It is not a de Polignac number, because 1191140821005 - 2² = 1191140821001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191140821001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650895709 + ... + 650897538.

It is an arithmetic number, because the mean of its divisors is an integer number (121066772064).

Almost surely, 2^{1191140821005} is an apocalyptic number.

1191140821005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1191140821005 is a deficient number, since it is larger than the sum of its proper divisors (745927532019).

1191140821005 is a wasteful number, since it uses less digits than its factorization.

1191140821005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301793316.

The product of its (nonzero) digits is 2880, while the sum is 33.

The spelling of 1191140821005 in words is "one trillion, one hundred ninety-one billion, one hundred forty million, eight hundred twenty-one thousand, five".