20001333121 has 32 divisors (see below), whose sum is σ = 25236921600. Its totient is φ = 15398657280.

The previous prime is 20001333073. The next prime is 20001333139. The reversal of 20001333121 is 12133310002.

It is a cyclic number.

It is not a de Polignac number, because 20001333121 - 2²⁷ = 19867115393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001333095 and 20001333104.

It is not an unprimeable number, because it can be changed into a prime (20001333161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3127395 + ... + 3133783.

It is an arithmetic number, because the mean of its divisors is an integer number (788653800).

Almost surely, 2^20001333121 is an apocalyptic number.

20001333121 is the 89446-th heptagonal number.

It is an amenable number.

20001333121 is a deficient number, since it is larger than the sum of its proper divisors (5235588479).

20001333121 is a wasteful number, since it uses less digits than its factorization.

20001333121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20001333121 its reverse (12133310002), we get a palindrome (32134643123).

The spelling of 20001333121 in words is "twenty billion, one million, three hundred thirty-three thousand, one hundred twenty-one".