20321323221 has 8 divisors (see below), whose sum is σ = 27106691040. Its totient is φ = 13541752112.

The previous prime is 20321323199. The next prime is 20321323237. The reversal of 20321323221 is 12232312302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20321323221 - 2⁶ = 20321323157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321323241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440990 + ... + 1455023.

It is an arithmetic number, because the mean of its divisors is an integer number (3388336380).

Almost surely, 2^20321323221 is an apocalyptic number.

It is an amenable number.

20321323221 is a deficient number, since it is larger than the sum of its proper divisors (6785367819).

20321323221 is a wasteful number, since it uses less digits than its factorization.

20321323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898355.

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

Adding to 20321323221 its reverse (12232312302), we get a palindrome (32553635523).

The spelling of 20321323221 in words is "twenty billion, three hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".