20123201221321 has 4 divisors (see below), whose sum is σ = 21952583150544. Its totient is φ = 18293819292100.

The previous prime is 20123201221303. The next prime is 20123201221337. The reversal of 20123201221321 is 12312210232102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20123201221321 - 2¹¹ = 20123201219273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123201221292 and 20123201221301.

It is not an unprimeable number, because it can be changed into a prime (20123201221381) 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 3 ways as a sum of consecutive naturals, for example, 914690964595 + ... + 914690964616.

It is an arithmetic number, because the mean of its divisors is an integer number (5488145787636).

Almost surely, 2^{20123201221321} is an apocalyptic number.

It is an amenable number.

20123201221321 is a deficient number, since it is larger than the sum of its proper divisors (1829381929223).

20123201221321 is a wasteful number, since it uses less digits than its factorization.

20123201221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829381929222.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20123201221321 its reverse (12312210232102), we get a palindrome (32435411453423).

The spelling of 20123201221321 in words is "twenty trillion, one hundred twenty-three billion, two hundred one million, two hundred twenty-one thousand, three hundred twenty-one".