1221021222222 has 32 divisors (see below), whose sum is σ = 2522582599680. Its totient is φ = 393602096160.

The previous prime is 1221021222217. The next prime is 1221021222247. The reversal of 1221021222222 is 2222221201221.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2031138 + ... + 2562725.

It is an arithmetic number, because the mean of its divisors is an integer number (78830706240).

Almost surely, 2^{1221021222222} is an apocalyptic number.

1221021222222 is an abundant number, since it is smaller than the sum of its proper divisors (1301561377458).

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

1221021222222 is a wasteful number, since it uses less digits than its factorization.

1221021222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595328.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1221021222222 its reverse (2222221201221), we get a palindrome (3443242423443).

The spelling of 1221021222222 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".