20121221121212 has 12 divisors (see below), whose sum is σ = 35694495003216. Its totient is φ = 9922793977440.

The previous prime is 20121221121193. The next prime is 20121221121217. The reversal of 20121221121212 is 21212112212102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121221121217) 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, 34454145464 + ... + 34454146047.

It is an arithmetic number, because the mean of its divisors is an integer number (2974541250268).

Almost surely, 2^{20121221121212} is an apocalyptic number.

It is an amenable number.

20121221121212 is a deficient number, since it is larger than the sum of its proper divisors (15573273882004).

20121221121212 is a wasteful number, since it uses less digits than its factorization.

20121221121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68908291588 (or 68908291586 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20121221121212 its reverse (21212112212102), we get a palindrome (41333333333314).

The spelling of 20121221121212 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".