20533113221 has 16 divisors (see below), whose sum is σ = 21491904000. Its totient is φ = 19594785600.

The previous prime is 20533113191. The next prime is 20533113229. The reversal of 20533113221 is 12231133502.

It is a cyclic number.

It is not a de Polignac number, because 20533113221 - 2³⁰ = 19459371397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533113229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 626051 + ... + 658031.

It is an arithmetic number, because the mean of its divisors is an integer number (1343244000).

Almost surely, 2^20533113221 is an apocalyptic number.

It is an amenable number.

20533113221 is a deficient number, since it is larger than the sum of its proper divisors (958790779).

20533113221 is a wasteful number, since it uses less digits than its factorization.

20533113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32300.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 20533113221 its reverse (12231133502), we get a palindrome (32764246723).

The spelling of 20533113221 in words is "twenty billion, five hundred thirty-three million, one hundred thirteen thousand, two hundred twenty-one".