20203011121 has 4 divisors (see below), whose sum is σ = 20479764772. Its totient is φ = 19926257472.

The previous prime is 20203011079. The next prime is 20203011139. The reversal of 20203011121 is 12111030202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12111030202 = 2 ⋅6055515101.

It can be written as a sum of positive squares in 2 ways, for example, as 9867442225 + 10335568896 = 99335^2 + 101664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203011121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20203011161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138376716 + ... + 138376861.

It is an arithmetic number, because the mean of its divisors is an integer number (5119941193).

Almost surely, 2^20203011121 is an apocalyptic number.

It is an amenable number.

20203011121 is a deficient number, since it is larger than the sum of its proper divisors (276753651).

20203011121 is an equidigital number, since it uses as much as digits as its factorization.

20203011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276753650.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20203011121 its reverse (12111030202), we get a palindrome (32314041323).

The spelling of 20203011121 in words is "twenty billion, two hundred three million, eleven thousand, one hundred twenty-one".