1221023312212 has 24 divisors (see below), whose sum is σ = 2331082454400. Its totient is φ = 555001560960.

The previous prime is 1221023312191. The next prime is 1221023312221. The reversal of 1221023312212 is 2122133201221.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 7 ways as a sum of consecutive naturals, for example, 3037164 + ... + 3415612.

It is an arithmetic number, because the mean of its divisors is an integer number (97128435600).

Almost surely, 2^{1221023312212} is an apocalyptic number.

It is an amenable number.

1221023312212 is a deficient number, since it is larger than the sum of its proper divisors (1110059142188).

1221023312212 is a wasteful number, since it uses less digits than its factorization.

1221023312212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451791 (or 451789 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221023312212 its reverse (2122133201221), we get a palindrome (3343156513433).

The spelling of 1221023312212 in words is "one trillion, two hundred twenty-one billion, twenty-three million, three hundred twelve thousand, two hundred twelve".