20121221122012 has 12 divisors (see below), whose sum is σ = 35215042579920. Its totient is φ = 10059780384896.

The previous prime is 20121221121893. The next prime is 20121221122111. The reversal of 20121221122012 is 21022112212102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207489493 + ... + 207586444.

It is an arithmetic number, because the mean of its divisors is an integer number (2934586881660).

Almost surely, 2^{20121221122012} is an apocalyptic number.

It is an amenable number.

20121221122012 is a deficient number, since it is larger than the sum of its proper divisors (15093821457908).

20121221122012 is a wasteful number, since it uses less digits than its factorization.

20121221122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415088060 (or 415088058 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20121221122012 its reverse (21022112212102), we get a palindrome (41143333334114).

The spelling of 20121221122012 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, twelve".