1212110123220 has 288 divisors, whose sum is σ = 3944556645120. Its totient is φ = 300493670400.

The previous prime is 1212110123207. The next prime is 1212110123221. The reversal of 1212110123220 is 223210112121.

1212110123220 is a `hidden beast` number, since 1 + 212 + 110 + 123 + 220 = 666.

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 = 1212110123193 and 1212110123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212110123221) 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, 160988416 + ... + 160995944.

It is an arithmetic number, because the mean of its divisors is an integer number (13696377240).

Almost surely, 2^{1212110123220} is an apocalyptic number.

1212110123220 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 1212110123220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1972278322560).

1212110123220 is an abundant number, since it is smaller than the sum of its proper divisors (2732446521900).

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

1212110123220 is a wasteful number, since it uses less digits than its factorization.

1212110123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8655 (or 8650 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1212110123220 its reverse (223210112121), we get a palindrome (1435320235341).

The spelling of 1212110123220 in words is "one trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-three thousand, two hundred twenty".