20121221116 has 12 divisors (see below), whose sum is σ = 35313615288. Its totient is φ = 10031616752.

The previous prime is 20121221041. The next prime is 20121221117. The reversal of 20121221116 is 61112212102.

It is a junction number, because it is equal to n+sod(n) for n = 20121221093 and 20121221102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121221117) 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, 7246891 + ... + 7249666.

It is an arithmetic number, because the mean of its divisors is an integer number (2942801274).

Almost surely, 2^20121221116 is an apocalyptic number.

It is an amenable number.

20121221116 is a deficient number, since it is larger than the sum of its proper divisors (15192394172).

20121221116 is a wasteful number, since it uses less digits than its factorization.

20121221116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14496908 (or 14496906 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20121221116 its reverse (61112212102), we get a palindrome (81233433218).

The spelling of 20121221116 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred sixteen".