12111212121102 has 12 divisors (see below), whose sum is σ = 26240959595760. Its totient is φ = 4037070707028.

The previous prime is 12111212121083. The next prime is 12111212121109. The reversal of 12111212121102 is 20112121211121.

It is a happy number.

12111212121102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 672845117839 = 12111212121102 / (1 + 2 + 1 + 1 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 1 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111212121109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 336422558902 + ... + 336422558937.

It is an arithmetic number, because the mean of its divisors is an integer number (2186746632980).

Almost surely, 2^{12111212121102} is an apocalyptic number.

12111212121102 is an abundant number, since it is smaller than the sum of its proper divisors (14129747474658).

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

12111212121102 is a wasteful number, since it uses less digits than its factorization.

12111212121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672845117847 (or 672845117844 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12111212121102 its reverse (20112121211121), we get a palindrome (32223333332223).

The spelling of 12111212121102 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred two".