12011121121212 has 72 divisors (see below), whose sum is σ = 31743751646880. Its totient is φ = 3822108850560.

The previous prime is 12011121121211. The next prime is 12011121121229. The reversal of 12011121121212 is 21212112111021.

It is a happy number.

12011121121212 is a `hidden beast` number, since 120 + 111 + 211 + 212 + 12 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011121121211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13828239 + ... + 14671142.

It is an arithmetic number, because the mean of its divisors is an integer number (440885439540).

Almost surely, 2^{12011121121212} is an apocalyptic number.

12011121121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12011121121212 is an abundant number, since it is smaller than the sum of its proper divisors (19732630525668).

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

12011121121212 is a wasteful number, since it uses less digits than its factorization.

12011121121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28499923 (or 28499918 counting only the distinct ones).

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

Adding to 12011121121212 its reverse (21212112111021), we get a palindrome (33223233232233).

The spelling of 12011121121212 in words is "twelve trillion, eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".