2221121200212 has 96 divisors (see below), whose sum is σ = 5822796349440. Its totient is φ = 732120681600.

The previous prime is 2221121200211. The next prime is 2221121200217. The reversal of 2221121200212 is 2120021211222.

It is a happy number.

2221121200212 is a `hidden beast` number, since 22 + 211 + 21 + 200 + 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 (2221121200211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8565933 + ... + 8821419.

It is an arithmetic number, because the mean of its divisors is an integer number (60654128640).

Almost surely, 2^{2221121200212} 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 2221121200212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2911398174720).

2221121200212 is an abundant number, since it is smaller than the sum of its proper divisors (3601675149228).

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

2221121200212 is a wasteful number, since it uses less digits than its factorization.

2221121200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256398 (or 256390 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2221121200212 its reverse (2120021211222), we get a palindrome (4341142411434).

The spelling of 2221121200212 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred thousand, two hundred twelve".