21323220203121 has 16 divisors (see below), whose sum is σ = 29324683799424. Its totient is φ = 13771916244864.

The previous prime is 21323220203059. The next prime is 21323220203143. The reversal of 21323220203121 is 12130202232312.

It is not a de Polignac number, because 21323220203121 - 2⁶ = 21323220203057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323220203091 and 21323220203100.

It is not an unprimeable number, because it can be changed into a prime (21323220203171) 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, 412208221 + ... + 412259946.

It is an arithmetic number, because the mean of its divisors is an integer number (1832792737464).

Almost surely, 2^{21323220203121} is an apocalyptic number.

It is an amenable number.

21323220203121 is a deficient number, since it is larger than the sum of its proper divisors (8001463596303).

21323220203121 is a wasteful number, since it uses less digits than its factorization.

21323220203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824468440.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21323220203121 its reverse (12130202232312), we get a palindrome (33453422435433).

The spelling of 21323220203121 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twenty million, two hundred three thousand, one hundred twenty-one".