222121111201212 has 96 divisors (see below), whose sum is σ = 543344720421888. Its totient is φ = 70490918006784.

The previous prime is 222121111201207. The next prime is 222121111201243. The reversal of 222121111201212 is 212102111121222.

It is a super-2 number, since 2×222121111201212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49638108 + ... + 53927580.

It is an arithmetic number, because the mean of its divisors is an integer number (5659840837728).

Almost surely, 2^{222121111201212} 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 222121111201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271672360210944).

222121111201212 is an abundant number, since it is smaller than the sum of its proper divisors (321223609220676).

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

222121111201212 is a wasteful number, since it uses less digits than its factorization.

222121111201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290379 (or 4290377 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 222121111201212 its reverse (212102111121222), we get a palindrome (434223222322434).

The spelling of 222121111201212 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twelve".