1220112212220 has 288 divisors, whose sum is σ = 4088116992960. Its totient is φ = 292082503680.

The previous prime is 1220112212213. The next prime is 1220112212227. The reversal of 1220112212220 is 222122110221.

It is a happy number.

1220112212220 is a `hidden beast` number, since 1 + 220 + 1 + 1 + 221 + 2 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (1220112212213) and next prime (1220112212227).

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

It is a junction number, because it is equal to n+sod(n) for n = 1220112212193 and 1220112212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220112212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 150311602 + ... + 150319718.

It is an arithmetic number, because the mean of its divisors is an integer number (14194850670).

Almost surely, 2^{1220112212220} is an apocalyptic number.

1220112212220 is a gapful number since it is divisible by the number (10) 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 1220112212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2044058496480).

1220112212220 is an abundant number, since it is smaller than the sum of its proper divisors (2868004780740).

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

1220112212220 is a wasteful number, since it uses less digits than its factorization.

1220112212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9085 (or 9080 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1220112212220 its reverse (222122110221), we get a palindrome (1442234322441).

The spelling of 1220112212220 in words is "one trillion, two hundred twenty billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty".