2201121121212 has 144 divisors (see below), whose sum is σ = 6138643230720. Its totient is φ = 660724089984.

The previous prime is 2201121121211. The next prime is 2201121121231. The reversal of 2201121121212 is 2121211211022.

2201121121212 is a `hidden beast` number, since 220 + 1 + 1 + 211 + 21 + 212 = 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 (2201121121211) 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 47 ways as a sum of consecutive naturals, for example, 16818853 + ... + 16949219.

It is an arithmetic number, because the mean of its divisors is an integer number (42629466880).

Almost surely, 2^{2201121121212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2201121121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3069321615360).

2201121121212 is an abundant number, since it is smaller than the sum of its proper divisors (3937522109508).

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

2201121121212 is a wasteful number, since it uses less digits than its factorization.

2201121121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131272 (or 131267 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2201121121212 its reverse (2121211211022), we get a palindrome (4322332332234).

The spelling of 2201121121212 in words is "two trillion, two hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".