11121121201212 has 216 divisors, whose sum is σ = 32169545689008. Its totient is φ = 3234034045440.

The previous prime is 11121121201171. The next prime is 11121121201213. The reversal of 11121121201212 is 21210212112111.

It is a happy number.

11121121201212 is a `hidden beast` number, since 11 + 121 + 121 + 201 + 212 = 666.

11121121201212 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).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121121201213) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11292943 + ... + 12238169.

Almost surely, 2^{11121121201212} is an apocalyptic number.

11121121201212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11121121201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16084772844504).

11121121201212 is an abundant number, since it is smaller than the sum of its proper divisors (21048424487796).

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

11121121201212 is a wasteful number, since it uses less digits than its factorization.

11121121201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945369 (or 945353 counting only the distinct ones).

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

Adding to 11121121201212 its reverse (21210212112111), we get a palindrome (32331333313323).

The spelling of 11121121201212 in words is "eleven trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred twelve".