1212221122112 has 672 divisors, whose sum is σ = 3364481691648. Its totient is φ = 420526080000.

The previous prime is 1212221122103. The next prime is 1212221122157. The reversal of 1212221122112 is 2112211222121.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4473140537 + ... + 4473140807.

It is an arithmetic number, because the mean of its divisors is an integer number (5006669184).

Almost surely, 2^{1212221122112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212221122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682240845824).

1212221122112 is an abundant number, since it is smaller than the sum of its proper divisors (2152260569536).

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

1212221122112 is a wasteful number, since it uses less digits than its factorization.

1212221122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 476 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

Adding to 1212221122112 its reverse (2112211222121), we get a palindrome (3324432344233).

The spelling of 1212221122112 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twelve".