1212221121012 has 216 divisors, whose sum is σ = 3499110142528. Its totient is φ = 366682567680.

The previous prime is 1212221120987. The next prime is 1212221121029. The reversal of 1212221121012 is 2101211222121.

1212221121012 is digitally balanced in base 12, because in such base it contains all the possibile digits an equal number of times.

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

1212221121012 is strictly pandigital in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 67853193 + ... + 67871055.

Almost surely, 2^{1212221121012} is an apocalyptic number.

1212221121012 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 1212221121012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749555071264).

1212221121012 is an abundant number, since it is smaller than the sum of its proper divisors (2286889021516).

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

1212221121012 is a wasteful number, since it uses less digits than its factorization.

1212221121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18481 (or 18456 counting only the distinct ones).

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

Adding to 1212221121012 its reverse (2101211222121), we get a palindrome (3313432343133).

The spelling of 1212221121012 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, twelve".