222111221201212 has 192 divisors, whose sum is σ = 511867728691200. Its totient is φ = 82112096183040.

The previous prime is 222111221201209. The next prime is 222111221201237. The reversal of 222111221201212 is 212102122111222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20785893 + ... + 29601955.

It is an arithmetic number, because the mean of its divisors is an integer number (2665977753600).

Almost surely, 2^{222111221201212} 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 222111221201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255933864345600).

222111221201212 is an abundant number, since it is smaller than the sum of its proper divisors (289756507489988).

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

222111221201212 is a wasteful number, since it uses less digits than its factorization.

222111221201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8816216 (or 8816214 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 222111221201212 its reverse (212102122111222), we get a palindrome (434213343312434).

The spelling of 222111221201212 in words is "two hundred twenty-two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred one thousand, two hundred twelve".