20012122202121 has 24 divisors (see below), whose sum is σ = 33804160653120. Its totient is φ = 11169556576416.

The previous prime is 20012122201987. The next prime is 20012122202123. The reversal of 20012122202121 is 12120222121002.

It is a happy number.

20012122202121 is a `hidden beast` number, since 20 + 0 + 1 + 212 + 220 + 212 + 1 = 666.

It is not a de Polignac number, because 20012122202121 - 2⁴² = 15614075691017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012122202094 and 20012122202103.

It is not an unprimeable number, because it can be changed into a prime (20012122202123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3693633726 + ... + 3693639143.

It is an arithmetic number, because the mean of its divisors is an integer number (1408506693880).

Almost surely, 2^{20012122202121} is an apocalyptic number.

20012122202121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20012122202121 is a deficient number, since it is larger than the sum of its proper divisors (13792038450999).

20012122202121 is a wasteful number, since it uses less digits than its factorization.

20012122202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7387272925 (or 7387272922 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20012122202121 its reverse (12120222121002), we get a palindrome (32132344323123).

The spelling of 20012122202121 in words is "twenty trillion, twelve billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-one".