1021201221222 has 144 divisors (see below), whose sum is σ = 2798798681952. Its totient is φ = 262048089600.

The previous prime is 1021201221217. The next prime is 1021201221239. The reversal of 1021201221222 is 2221221021201.

It is a happy number.

1021201221222 is a `hidden beast` number, since 1 + 0 + 21 + 201 + 221 + 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 = 1021201221195 and 1021201221204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2014722 + ... + 2470122.

It is an arithmetic number, because the mean of its divisors is an integer number (19436101958).

Almost surely, 2^{1021201221222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021201221222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1399399340976).

1021201221222 is an abundant number, since it is smaller than the sum of its proper divisors (1777597460730).

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

1021201221222 is a wasteful number, since it uses less digits than its factorization.

1021201221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455503 (or 455463 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1021201221222 its reverse (2221221021201), we get a palindrome (3242422242423).

The spelling of 1021201221222 in words is "one trillion, twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-two".