1221122222112 has 192 divisors, whose sum is σ = 3569278898304. Its totient is φ = 363138293760.

The previous prime is 1221122222081. The next prime is 1221122222119. The reversal of 1221122222112 is 2112222211221.

It is a super-2 number, since 2×1221122222112² (a number of 25 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1221122222119) 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, 5363458 + ... + 5586494.

It is an arithmetic number, because the mean of its divisors is an integer number (18589994262).

Almost surely, 2^{1221122222112} is an apocalyptic number.

1221122222112 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 1221122222112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784639449152).

1221122222112 is an abundant number, since it is smaller than the sum of its proper divisors (2348156676192).

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

1221122222112 is a wasteful number, since it uses less digits than its factorization.

1221122222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223211 (or 223203 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

Adding to 1221122222112 its reverse (2112222211221), we get a palindrome (3333344433333).

The spelling of 1221122222112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twelve".