20001123321 has 8 divisors (see below), whose sum is σ = 26685589344. Its totient is φ = 13325369760.

The previous prime is 20001123277. The next prime is 20001123349. The reversal of 20001123321 is 12332110002.

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

It is not a de Polignac number, because 20001123321 - 2⁶ = 20001123257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001123321.

It is not an unprimeable number, because it can be changed into a prime (20001123371) 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, 2172756 + ... + 2181941.

It is an arithmetic number, because the mean of its divisors is an integer number (3335698668).

Almost surely, 2^20001123321 is an apocalyptic number.

It is an amenable number.

20001123321 is a deficient number, since it is larger than the sum of its proper divisors (6684466023).

20001123321 is a wasteful number, since it uses less digits than its factorization.

20001123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356231.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20001123321 its reverse (12332110002), we get a palindrome (32333233323).

The spelling of 20001123321 in words is "twenty billion, one million, one hundred twenty-three thousand, three hundred twenty-one".