1211222112 has 48 divisors (see below), whose sum is σ = 3181550400. Its totient is φ = 403475072.

The previous prime is 1211222099. The next prime is 1211222153. The reversal of 1211222112 is 2112221121.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1211222091 and 1211222100.

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, 189139 + ... + 195437.

It is an arithmetic number, because the mean of its divisors is an integer number (66282300).

Almost surely, 2^1211222112 is an apocalyptic number.

1211222112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211222112 is an abundant number, since it is smaller than the sum of its proper divisors (1970328288).

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

1211222112 is a wasteful number, since it uses less digits than its factorization.

1211222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315 (or 8307 counting only the distinct ones).

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

The square root of 1211222112 is about 34802.6164533645. The cubic root of 1211222112 is about 1065.9608723276.

Adding to 1211222112 its reverse (2112221121), we get a palindrome (3323443233).

Subtracting 1211222112 from its reverse (2112221121), we obtain a palindrome (900999009).

The spelling of 1211222112 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twelve".