20121222120111 has 80 divisors (see below), whose sum is σ = 36379237847040. Its totient is φ = 10819420335360.

The previous prime is 20121222120049. The next prime is 20121222120143. The reversal of 20121222120111 is 11102122212102.

20121222120111 is a `hidden beast` number, since 20 + 1 + 212 + 221 + 201 + 11 = 666.

It is not a de Polignac number, because 20121222120111 - 2⁶ = 20121222120047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121222121111) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 50686566 + ... + 51081996.

It is an arithmetic number, because the mean of its divisors is an integer number (454740473088).

Almost surely, 2^{20121222120111} is an apocalyptic number.

20121222120111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20121222120111 is a deficient number, since it is larger than the sum of its proper divisors (16258015726929).

20121222120111 is a wasteful number, since it uses less digits than its factorization.

20121222120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400746 (or 400737 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20121222120111 its reverse (11102122212102), we get a palindrome (31223344332213).

The spelling of 20121222120111 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, one hundred eleven".