1221021222212 has 12 divisors (see below), whose sum is σ = 2331040515216. Its totient is φ = 555009646440.

The previous prime is 1221021222203. The next prime is 1221021222217. The reversal of 1221021222212 is 2122221201221.

It is not an unprimeable number, because it can be changed into a prime (1221021222217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13875241118 + ... + 13875241205.

It is an arithmetic number, because the mean of its divisors is an integer number (194253376268).

Almost surely, 2^{1221021222212} is an apocalyptic number.

It is an amenable number.

1221021222212 is a deficient number, since it is larger than the sum of its proper divisors (1110019293004).

1221021222212 is a wasteful number, since it uses less digits than its factorization.

1221021222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27750482338 (or 27750482336 counting only the distinct ones).

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

Adding to 1221021222212 its reverse (2122221201221), we get a palindrome (3343242423433).

The spelling of 1221021222212 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred twelve".