20012120123121 has 12 divisors (see below), whose sum is σ = 33035880838272. Its totient is φ = 11435497213176.

The previous prime is 20012120123113. The next prime is 20012120123123. The reversal of 20012120123121 is 12132102121002.

20012120123121 is a `hidden beast` number, since 200 + 1 + 212 + 0 + 1 + 231 + 21 = 666.

It is not a de Polignac number, because 20012120123121 - 2³ = 20012120123113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012120123094 and 20012120123103.

It is not an unprimeable number, because it can be changed into a prime (20012120123123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158826350121 + ... + 158826350246.

It is an arithmetic number, because the mean of its divisors is an integer number (2752990069856).

Almost surely, 2^{20012120123121} is an apocalyptic number.

20012120123121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20012120123121 is a deficient number, since it is larger than the sum of its proper divisors (13023760715151).

20012120123121 is a wasteful number, since it uses less digits than its factorization.

20012120123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317652700380 (or 317652700377 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20012120123121 its reverse (12132102121002), we get a palindrome (32144222244123).

The spelling of 20012120123121 in words is "twenty trillion, twelve billion, one hundred twenty million, one hundred twenty-three thousand, one hundred twenty-one".