1211222112012 has 216 divisors, whose sum is σ = 3455103091440. Its totient is φ = 354778444800.

The previous prime is 1211222112007. The next prime is 1211222112077. The reversal of 1211222112012 is 2102112221121.

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

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, 72550338 + ... + 72567030.

Almost surely, 2^{1211222112012} is an apocalyptic number.

1211222112012 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 1211222112012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727551545720).

1211222112012 is an abundant number, since it is smaller than the sum of its proper divisors (2243880979428).

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

1211222112012 is a wasteful number, since it uses less digits than its factorization.

1211222112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16905 (or 16859 counting only the distinct ones).

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

Adding to 1211222112012 its reverse (2102112221121), we get a palindrome (3313334333133).

The spelling of 1211222112012 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twelve thousand, twelve".