20121110121 has 64 divisors (see below), whose sum is σ = 32920473600. Its totient is φ = 10670094336.

The previous prime is 20121110117. The next prime is 20121110131. The reversal of 20121110121 is 12101112102.

It is not a de Polignac number, because 20121110121 - 2² = 20121110117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121110097 and 20121110106.

It is not an unprimeable number, because it can be changed into a prime (20121110131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15981190 + ... + 15982448.

It is an arithmetic number, because the mean of its divisors is an integer number (514382400).

Almost surely, 2^20121110121 is an apocalyptic number.

20121110121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20121110121 is a deficient number, since it is larger than the sum of its proper divisors (12799363479).

20121110121 is a wasteful number, since it uses less digits than its factorization.

20121110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121110121 its reverse (12101112102), we get a palindrome (32222222223).

The spelling of 20121110121 in words is "twenty billion, one hundred twenty-one million, one hundred ten thousand, one hundred twenty-one".