12121111098 has 24 divisors (see below), whose sum is σ = 26414219988. Its totient is φ = 4017014592.

The previous prime is 12121111097. The next prime is 12121111117. The reversal of 12121111098 is 89011112121.

It can be written as a sum of positive squares in 2 ways, for example, as 11463342489 + 657768609 = 107067^2 + 25647^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12121111091) 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 11 ways as a sum of consecutive naturals, for example, 1943115 + ... + 1949342.

Almost surely, 2^12121111098 is an apocalyptic number.

12121111098 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12121111098 is an abundant number, since it is smaller than the sum of its proper divisors (14293108890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121111098 is a wasteful number, since it uses less digits than its factorization.

12121111098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3892638 (or 3892635 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 27.

The spelling of 12121111098 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, ninety-eight".