1221112212 has 24 divisors (see below), whose sum is σ = 2853244800. Its totient is φ = 406468416.

The previous prime is 1221112201. The next prime is 1221112241. The reversal of 1221112212 is 2122111221.

It is a super-3 number, since 3×1221112212³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221112191 and 1221112200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62137 + ... + 79392.

It is an arithmetic number, because the mean of its divisors is an integer number (118885200).

Almost surely, 2^1221112212 is an apocalyptic number.

1221112212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221112212 is an abundant number, since it is smaller than the sum of its proper divisors (1632132588).

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

1221112212 is a wasteful number, since it uses less digits than its factorization.

1221112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142255 (or 142253 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 1221112212 is about 34944.4160346113. The cubic root of 1221112212 is about 1068.8543396098.

Adding to 1221112212 its reverse (2122111221), we get a palindrome (3343223433).

Subtracting 1221112212 from its reverse (2122111221), we obtain a palindrome (900999009).

It can be divided in two parts, 122111221 and 2, that multiplied together give a palindrome (244222442).

The spelling of 1221112212 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twelve".