20031000121 has 16 divisors (see below), whose sum is σ = 21906662400. Its totient is φ = 18164522880.

The previous prime is 20031000043. The next prime is 20031000131. The reversal of 20031000121 is 12100013002.

It is a cyclic number.

It is not a de Polignac number, because 20031000121 - 2¹¹ = 20030998073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031000098 and 20031000107.

It is not an unprimeable number, because it can be changed into a prime (20031000131) 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, 12542095 + ... + 12543691.

It is an arithmetic number, because the mean of its divisors is an integer number (1369166400).

Almost surely, 2^20031000121 is an apocalyptic number.

It is an amenable number.

20031000121 is a deficient number, since it is larger than the sum of its proper divisors (1875662279).

20031000121 is a wasteful number, since it uses less digits than its factorization.

20031000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20031000121 its reverse (12100013002), we get a palindrome (32131013123).

The spelling of 20031000121 in words is "twenty billion, thirty-one million, one hundred twenty-one", and thus it is an aban number.