12121111099 has 8 divisors (see below), whose sum is σ = 12331008000. Its totient is φ = 11911362792.

The previous prime is 12121111097. The next prime is 12121111117. The reversal of 12121111099 is 99011112121.

It is a happy number.

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 12121111099 - 2¹ = 12121111097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121111091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134182 + ... + 205540.

It is an arithmetic number, because the mean of its divisors is an integer number (1541376000).

Almost surely, 2^12121111099 is an apocalyptic number.

12121111099 is a deficient number, since it is larger than the sum of its proper divisors (209896901).

12121111099 is an equidigital number, since it uses as much as digits as its factorization.

12121111099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74297.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 12121111099 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, ninety-nine".