20121221102012 has 24 divisors (see below), whose sum is σ = 38261065597440. Its totient is φ = 9223649740080.

The previous prime is 20121221101997. The next prime is 20121221102039. The reversal of 20121221102012 is 21020112212102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4270205858 + ... + 4270210569.

It is an arithmetic number, because the mean of its divisors is an integer number (1594211066560).

Almost surely, 2^{20121221102012} is an apocalyptic number.

It is an amenable number.

20121221102012 is a deficient number, since it is larger than the sum of its proper divisors (18139844495428).

20121221102012 is a wasteful number, since it uses less digits than its factorization.

20121221102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540416481 (or 8540416479 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20121221102012 its reverse (21020112212102), we get a palindrome (41141333314114).

The spelling of 20121221102012 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, twelve".