1221104112 has 20 divisors (see below), whose sum is σ = 3154519080. Its totient is φ = 407034688.

The previous prime is 1221104099. The next prime is 1221104117. The reversal of 1221104112 is 2114011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221104091 and 1221104100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221104117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12719787 + ... + 12719882.

It is an arithmetic number, because the mean of its divisors is an integer number (157725954).

Almost surely, 2^1221104112 is an apocalyptic number.

1221104112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221104112 is an abundant number, since it is smaller than the sum of its proper divisors (1933414968).

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

1221104112 is a wasteful number, since it uses less digits than its factorization.

1221104112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25439680 (or 25439674 counting only the distinct ones).

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

The square root of 1221104112 is about 34944.3001360737. The cubic root of 1221104112 is about 1068.8519762618.

Adding to 1221104112 its reverse (2114011221), we get a palindrome (3335115333).

The spelling of 1221104112 in words is "one billion, two hundred twenty-one million, one hundred four thousand, one hundred twelve".