20201223210321 has 16 divisors (see below), whose sum is σ = 27179084790720. Its totient is φ = 13345472394240.

The previous prime is 20201223210317. The next prime is 20201223210323. The reversal of 20201223210321 is 12301232210202.

It is not a de Polignac number, because 20201223210321 - 2² = 20201223210317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20201223210323) 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, 4710811 + ... + 7911648.

It is an arithmetic number, because the mean of its divisors is an integer number (1698692799420).

Almost surely, 2^{20201223210321} is an apocalyptic number.

It is an amenable number.

20201223210321 is a deficient number, since it is larger than the sum of its proper divisors (6977861580399).

20201223210321 is a wasteful number, since it uses less digits than its factorization.

20201223210321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12627296.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20201223210321 its reverse (12301232210202), we get a palindrome (32502455420523).

The spelling of 20201223210321 in words is "twenty trillion, two hundred one billion, two hundred twenty-three million, two hundred ten thousand, three hundred twenty-one".