1212101211222 has 144 divisors (see below), whose sum is σ = 2943583493760. Its totient is φ = 360073359360.

The previous prime is 1212101211143. The next prime is 1212101211271. The reversal of 1212101211222 is 2221121012121.

1212101211222 is a `hidden beast` number, since 1 + 21 + 210 + 1 + 211 + 222 = 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 = 1212101211195 and 1212101211204.

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, 166105878 + ... + 166113174.

It is an arithmetic number, because the mean of its divisors is an integer number (20441552040).

Almost surely, 2^{1212101211222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212101211222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471791746880).

1212101211222 is an abundant number, since it is smaller than the sum of its proper divisors (1731482282538).

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

1212101211222 is a wasteful number, since it uses less digits than its factorization.

1212101211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8819 (or 8805 counting only the distinct ones).

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

Adding to 1212101211222 its reverse (2221121012121), we get a palindrome (3433222223343).

The spelling of 1212101211222 in words is "one trillion, two hundred twelve billion, one hundred one million, two hundred eleven thousand, two hundred twenty-two".