20533232321 has 16 divisors (see below), whose sum is σ = 23641374720. Its totient is φ = 17468989200.

The previous prime is 20533232311. The next prime is 20533232327. The reversal of 20533232321 is 12323233502.

It is a cyclic number.

It is not a de Polignac number, because 20533232321 - 2⁶ = 20533232257 is a prime.

It is a super-2 number, since 2×20533232321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20533232327) 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, 1395320 + ... + 1409958.

It is an arithmetic number, because the mean of its divisors is an integer number (1477585920).

Almost surely, 2^20533232321 is an apocalyptic number.

It is an amenable number.

20533232321 is a deficient number, since it is larger than the sum of its proper divisors (3108142399).

20533232321 is a wasteful number, since it uses less digits than its factorization.

20533232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16124.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 20533232321 its reverse (12323233502), we get a palindrome (32856465823).

The spelling of 20533232321 in words is "twenty billion, five hundred thirty-three million, two hundred thirty-two thousand, three hundred twenty-one".