20503043121 has 32 divisors (see below), whose sum is σ = 30343772160. Its totient is φ = 12209371200.

The previous prime is 20503043107. The next prime is 20503043129. The reversal of 20503043121 is 12134030502.

It is not a de Polignac number, because 20503043121 - 2²⁶ = 20435934257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20503043129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2086606 + ... + 2096408.

It is an arithmetic number, because the mean of its divisors is an integer number (948242880).

Almost surely, 2^20503043121 is an apocalyptic number.

It is an amenable number.

20503043121 is a deficient number, since it is larger than the sum of its proper divisors (9840729039).

20503043121 is a wasteful number, since it uses less digits than its factorization.

20503043121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20503043121 its reverse (12134030502), we get a palindrome (32637073623).

The spelling of 20503043121 in words is "twenty billion, five hundred three million, forty-three thousand, one hundred twenty-one".