20003120121 has 16 divisors (see below), whose sum is σ = 26930590400. Its totient is φ = 13206017088.

The previous prime is 20003120119. The next prime is 20003120131. The reversal of 20003120121 is 12102130002.

It is not a de Polignac number, because 20003120121 - 2¹ = 20003120119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20003120097 and 20003120106.

It is not an unprimeable number, because it can be changed into a prime (20003120131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105135 + ... + 225963.

It is an arithmetic number, because the mean of its divisors is an integer number (1683161900).

Almost surely, 2^20003120121 is an apocalyptic number.

It is an amenable number.

20003120121 is a deficient number, since it is larger than the sum of its proper divisors (6927470279).

20003120121 is a wasteful number, since it uses less digits than its factorization.

20003120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121368.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20003120121 its reverse (12102130002), we get a palindrome (32105250123).

The spelling of 20003120121 in words is "twenty billion, three million, one hundred twenty thousand, one hundred twenty-one".