1220221121112 has 64 divisors (see below), whose sum is σ = 3873717849600. Its totient is φ = 348634605600.

The previous prime is 1220221121099. The next prime is 1220221121117. The reversal of 1220221121112 is 2111211220221.

1220221121112 is a `hidden beast` number, since 1 + 220 + 221 + 1 + 211 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221121117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403510764 + ... + 403513787.

It is an arithmetic number, because the mean of its divisors is an integer number (60526841400).

Almost surely, 2^{1220221121112} is an apocalyptic number.

1220221121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220221121112 is an abundant number, since it is smaller than the sum of its proper divisors (2653496728488).

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

1220221121112 is a wasteful number, since it uses less digits than its factorization.

1220221121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807024573 (or 807024563 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1220221121112 its reverse (2111211220221), we get a palindrome (3331432341333).

The spelling of 1220221121112 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred twelve".