1221213320212 has 24 divisors (see below), whose sum is σ = 2156936544000. Its totient is φ = 604950251136.

The previous prime is 1221213320191. The next prime is 1221213320213. The reversal of 1221213320212 is 2120233121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221213320213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521239 + ... + 1647457.

It is an arithmetic number, because the mean of its divisors is an integer number (89872356000).

Almost surely, 2^{1221213320212} is an apocalyptic number.

It is an amenable number.

1221213320212 is a deficient number, since it is larger than the sum of its proper divisors (935723223788).

1221213320212 is a wasteful number, since it uses less digits than its factorization.

1221213320212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128735 (or 1128733 counting only the distinct ones).

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

Adding to 1221213320212 its reverse (2120233121221), we get a palindrome (3341446441433).

The spelling of 1221213320212 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred twelve".