12221212021212 has 12 divisors (see below), whose sum is σ = 28516161382856. Its totient is φ = 4073737340400.

The previous prime is 12221212021201. The next prime is 12221212021217. The reversal of 12221212021212 is 21212021212221.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221212021217) 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, 509217167539 + ... + 509217167562.

Almost surely, 2^{12221212021212} is an apocalyptic number.

12221212021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12221212021212 is an abundant number, since it is smaller than the sum of its proper divisors (16294949361644).

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

12221212021212 is a wasteful number, since it uses less digits than its factorization.

12221212021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018434335108 (or 1018434335106 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12221212021212 its reverse (21212021212221), we get a palindrome (33433233233433).

The spelling of 12221212021212 in words is "twelve trillion, two hundred twenty-one billion, two hundred twelve million, twenty-one thousand, two hundred twelve".