20003123121 has 8 divisors (see below), whose sum is σ = 26688348960. Its totient is φ = 13326656352.

The previous prime is 20003123093. The next prime is 20003123141. The reversal of 20003123121 is 12132130002.

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

It is not a de Polignac number, because 20003123121 - 2²⁹ = 19466252209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20003123121.

It is not an unprimeable number, because it can be changed into a prime (20003123141) 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, 2184436 + ... + 2193573.

It is an arithmetic number, because the mean of its divisors is an integer number (3336043620).

Almost surely, 2^20003123121 is an apocalyptic number.

It is an amenable number.

20003123121 is a deficient number, since it is larger than the sum of its proper divisors (6685225839).

20003123121 is a wasteful number, since it uses less digits than its factorization.

20003123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379535.

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

Adding to 20003123121 its reverse (12132130002), we get a palindrome (32135253123).

The spelling of 20003123121 in words is "twenty billion, three million, one hundred twenty-three thousand, one hundred twenty-one".