1221110112 has 96 divisors (see below), whose sum is σ = 3435409152. Its totient is φ = 378791424.

The previous prime is 1221110101. The next prime is 1221110123. The reversal of 1221110112 is 2110111221.

It is an interprime number because it is at equal distance from previous prime (1221110101) and next prime (1221110123).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1221110112² = 2982219811257305088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

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, 74223 + ... + 89169.

It is an arithmetic number, because the mean of its divisors is an integer number (35785512).

Almost surely, 2^1221110112 is an apocalyptic number.

1221110112 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 1221110112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717704576).

1221110112 is an abundant number, since it is smaller than the sum of its proper divisors (2214299040).

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

1221110112 is a wasteful number, since it uses less digits than its factorization.

1221110112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15020 (or 15012 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1221110112 is about 34944.3859868792. The cubic root of 1221110112 is about 1068.8537268909.

Adding to 1221110112 its reverse (2110111221), we get a palindrome (3331221333).

The spelling of 1221110112 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, one hundred twelve".