20001122121 has 8 divisors (see below), whose sum is σ = 26727559200. Its totient is φ = 13304383232.

The previous prime is 20001122093. The next prime is 20001122171. The reversal of 20001122121 is 12122110002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001122121 - 2¹⁰ = 20001121097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001122097 and 20001122106.

It is not an unprimeable number, because it can be changed into a prime (20001122171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7422975 + ... + 7425668.

It is an arithmetic number, because the mean of its divisors is an integer number (3340944900).

Almost surely, 2^20001122121 is an apocalyptic number.

It is an amenable number.

20001122121 is a deficient number, since it is larger than the sum of its proper divisors (6726437079).

20001122121 is a wasteful number, since it uses less digits than its factorization.

20001122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14849095.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001122121 its reverse (12122110002), we get a palindrome (32123232123).

The spelling of 20001122121 in words is "twenty billion, one million, one hundred twenty-two thousand, one hundred twenty-one".