1212222212120 has 128 divisors (see below), whose sum is σ = 2817487411200. Its totient is φ = 469142592000.

The previous prime is 1212222212111. The next prime is 1212222212147. The reversal of 1212222212120 is 212122222121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1212222212092 and 1212222212101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131202461 + ... + 131211699.

It is an arithmetic number, because the mean of its divisors is an integer number (22011620400).

Almost surely, 2^{1212222212120} is an apocalyptic number.

1212222212120 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 1212222212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1408743705600).

1212222212120 is an abundant number, since it is smaller than the sum of its proper divisors (1605265199080).

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

1212222212120 is a wasteful number, since it uses less digits than its factorization.

1212222212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10089 (or 10085 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1212222212120 its reverse (212122222121), we get a palindrome (1424344434241).

The spelling of 1212222212120 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty".