1220122111212 has 144 divisors (see below), whose sum is σ = 3306321607680. Its totient is φ = 378390317184.

The previous prime is 1220122111183. The next prime is 1220122111213. The reversal of 1220122111212 is 2121112210221.

1220122111212 is a `hidden beast` number, since 1 + 220 + 1 + 221 + 11 + 212 = 666.

It is a super-2 number, since 2×1220122111212² (a number of 25 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1220122111213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191870089 + ... + 191876447.

It is an arithmetic number, because the mean of its divisors is an integer number (22960566720).

Almost surely, 2^{1220122111212} is an apocalyptic number.

1220122111212 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 1220122111212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653160803840).

1220122111212 is an abundant number, since it is smaller than the sum of its proper divisors (2086199496468).

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

1220122111212 is a wasteful number, since it uses less digits than its factorization.

1220122111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12692 (or 12687 counting only the distinct ones).

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

Adding to 1220122111212 its reverse (2121112210221), we get a palindrome (3341234321433).

Subtracting 1220122111212 from its reverse (2121112210221), we obtain a palindrome (900990099009).

The spelling of 1220122111212 in words is "one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twelve".