21223201123121 has 4 divisors (see below), whose sum is σ = 21223245577200. Its totient is φ = 21223156669044.

The previous prime is 21223201123097. The next prime is 21223201123141. The reversal of 21223201123121 is 12132110232212.

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 a cyclic number.

It is not a de Polignac number, because 21223201123121 - 2¹⁸ = 21223200860977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223201123141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21503051 + ... + 22468368.

It is an arithmetic number, because the mean of its divisors is an integer number (5305811394300).

Almost surely, 2^{21223201123121} is an apocalyptic number.

It is an amenable number.

21223201123121 is a deficient number, since it is larger than the sum of its proper divisors (44454079).

21223201123121 is an equidigital number, since it uses as much as digits as its factorization.

21223201123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44454078.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21223201123121 its reverse (12132110232212), we get a palindrome (33355311355333).

The spelling of 21223201123121 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred one million, one hundred twenty-three thousand, one hundred twenty-one".