1221010112 has 112 divisors (see below), whose sum is σ = 2856049152. Its totient is φ = 507064320.

The previous prime is 1221010111. The next prime is 1221010117. The reversal of 1221010112 is 2110101221.

It is a tau number, because it is divible by the number of its divisors (112).

It is a junction number, because it is equal to n+sod(n) for n = 1221010093 and 1221010102.

It is not an unprimeable number, because it can be changed into a prime (1221010111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4642493 + ... + 4642755.

Almost surely, 2^1221010112 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 1221010112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428024576).

1221010112 is an abundant number, since it is smaller than the sum of its proper divisors (1635039040).

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

1221010112 is a wasteful number, since it uses less digits than its factorization.

1221010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1221010112 is about 34942.9551125831. The cubic root of 1221010112 is about 1068.8245489897.

Adding to 1221010112 its reverse (2110101221), we get a palindrome (3331111333).

It can be divided in two parts, 12210 and 10112, that added together give a palindrome (22322).

The spelling of 1221010112 in words is "one billion, two hundred twenty-one million, ten thousand, one hundred twelve".