1189109108921 has 8 divisors (see below), whose sum is σ = 1201558166760. Its totient is φ = 1176663932928.

The previous prime is 1189109108909. The next prime is 1189109108927. The reversal of 1189109108921 is 1298019019811.

It can be written as a sum of positive squares in 4 ways, for example, as 106550016400 + 1082559092521 = 326420^2 + 1040461^2 .

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 1189109108921 - 2¹⁴ = 1189109092537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1189109108921.

It is not an unprimeable number, because it can be changed into a prime (1189109108927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352556 + ... + 1581933.

It is an arithmetic number, because the mean of its divisors is an integer number (150194770845).

Almost surely, 2^{1189109108921} is an apocalyptic number.

It is an amenable number.

1189109108921 is a deficient number, since it is larger than the sum of its proper divisors (12449057839).

1189109108921 is an equidigital number, since it uses as much as digits as its factorization.

1189109108921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940923.

The product of its (nonzero) digits is 93312, while the sum is 50.

The spelling of 1189109108921 in words is "one trillion, one hundred eighty-nine billion, one hundred nine million, one hundred eight thousand, nine hundred twenty-one".