20321232321 has 16 divisors (see below), whose sum is σ = 30185386560. Its totient is φ = 12074153280.

The previous prime is 20321232311. The next prime is 20321232329. The reversal of 20321232321 is 12323212302.

It is a happy number.

It is not a de Polignac number, because 20321232321 - 2⁷ = 20321232193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20321232329) 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, 8982615 + ... + 8984876.

It is an arithmetic number, because the mean of its divisors is an integer number (1886586660).

Almost surely, 2^20321232321 is an apocalyptic number.

It is an amenable number.

20321232321 is a deficient number, since it is larger than the sum of its proper divisors (9864154239).

20321232321 is a wasteful number, since it uses less digits than its factorization.

20321232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17967536.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20321232321 its reverse (12323212302), we get a palindrome (32644444623).

The spelling of 20321232321 in words is "twenty billion, three hundred twenty-one million, two hundred thirty-two thousand, three hundred twenty-one".