111201021211212 has 288 divisors, whose sum is σ = 309746343997440. Its totient is φ = 34489942502400.

The previous prime is 111201021211153. The next prime is 111201021211219. The reversal of 111201021211212 is 212112120102111.

It is a happy number.

It is a super-2 number, since 2×111201021211212² (a number of 29 digits) contains 22 as substring.

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 (111201021211219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2153071573 + ... + 2153123219.

It is an arithmetic number, because the mean of its divisors is an integer number (1075508138880).

Almost surely, 2^{111201021211212} is an apocalyptic number.

111201021211212 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 111201021211212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154873171998720).

111201021211212 is an abundant number, since it is smaller than the sum of its proper divisors (198545322786228).

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

111201021211212 is a wasteful number, since it uses less digits than its factorization.

111201021211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52478 (or 52453 counting only the distinct ones).

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

Adding to 111201021211212 its reverse (212112120102111), we get a palindrome (323313141313323).

The spelling of 111201021211212 in words is "one hundred eleven trillion, two hundred one billion, twenty-one million, two hundred eleven thousand, two hundred twelve".