20321223321 has 16 divisors (see below), whose sum is σ = 31095244800. Its totient is φ = 11563538448.

The previous prime is 20321223283. The next prime is 20321223337. The reversal of 20321223321 is 12332212302.

It is a happy number.

It is not a de Polignac number, because 20321223321 - 2⁶ = 20321223257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20321223371) 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, 2019411 + ... + 2029448.

It is an arithmetic number, because the mean of its divisors is an integer number (1943452800).

Almost surely, 2^20321223321 is an apocalyptic number.

20321223321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20321223321 is a deficient number, since it is larger than the sum of its proper divisors (10774021479).

20321223321 is a wasteful number, since it uses less digits than its factorization.

20321223321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049108.

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

Adding to 20321223321 its reverse (12332212302), we get a palindrome (32653435623).

The spelling of 20321223321 in words is "twenty billion, three hundred twenty-one million, two hundred twenty-three thousand, three hundred twenty-one".