12111211122210 has 96 divisors (see below), whose sum is σ = 32343551802432. Its totient is φ = 3142043291520.

The previous prime is 12111211122193. The next prime is 12111211122217. The reversal of 12111211122210 is 1222111211121.

It is a happy number.

12111211122210 is a `hidden beast` number, since 1 + 211 + 121 + 1 + 122 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12111211122217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32887117 + ... + 33253343.

It is an arithmetic number, because the mean of its divisors is an integer number (336911997942).

Almost surely, 2^{12111211122210} is an apocalyptic number.

12111211122210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12111211122210 is an abundant number, since it is smaller than the sum of its proper divisors (20232340680222).

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

12111211122210 is a wasteful number, since it uses less digits than its factorization.

12111211122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376208 (or 376205 counting only the distinct ones).

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

Adding to 12111211122210 its reverse (1222111211121), we get a palindrome (13333322333331).

The spelling of 12111211122210 in words is "twelve trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, two hundred ten".