1212021221222 has 16 divisors (see below), whose sum is σ = 2078608234752. Its totient is φ = 519223273800.

The previous prime is 1212021221189. The next prime is 1212021221227. The reversal of 1212021221222 is 2221221202121.

It is a junction number, because it is equal to n+sod(n) for n = 1212021221194 and 1212021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021221227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17830904 + ... + 17898747.

It is an arithmetic number, because the mean of its divisors is an integer number (129913014672).

Almost surely, 2^{1212021221222} is an apocalyptic number.

1212021221222 is a deficient number, since it is larger than the sum of its proper divisors (866587013530).

1212021221222 is a wasteful number, since it uses less digits than its factorization.

1212021221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35732083.

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

Adding to 1212021221222 its reverse (2221221202121), we get a palindrome (3433242423343).

The spelling of 1212021221222 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".