109878188821 has 2 divisors, whose sum is σ = 109878188822. Its totient is φ = 109878188820.

The previous prime is 109878188809. The next prime is 109878188839. The reversal of 109878188821 is 128881878901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95499540900 + 14378647921 = 309030^2 + 119911^2 .

It is a cyclic number.

It is not a de Polignac number, because 109878188821 - 2⁹ = 109878188309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 109878188821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109878188851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54939094410 + 54939094411.

It is an arithmetic number, because the mean of its divisors is an integer number (54939094411).

Almost surely, 2^109878188821 is an apocalyptic number.

It is an amenable number.

109878188821 is a deficient number, since it is larger than the sum of its proper divisors (1).

109878188821 is an equidigital number, since it uses as much as digits as its factorization.

109878188821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4128768, while the sum is 61.

The spelling of 109878188821 in words is "one hundred nine billion, eight hundred seventy-eight million, one hundred eighty-eight thousand, eight hundred twenty-one".