21223223132123 has 4 divisors (see below), whose sum is σ = 21223483076208. Its totient is φ = 21222963188040.

The previous prime is 21223223132099. The next prime is 21223223132171. The reversal of 21223223132123 is 32123132232212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21223223132123 - 2⁸ = 21223223131867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223223132173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129849536 + ... + 130012877.

It is an arithmetic number, because the mean of its divisors is an integer number (5305870769052).

Almost surely, 2^{21223223132123} is an apocalyptic number.

21223223132123 is a deficient number, since it is larger than the sum of its proper divisors (259944085).

21223223132123 is an equidigital number, since it uses as much as digits as its factorization.

21223223132123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259944084.

The product of its digits is 10368, while the sum is 29.

Adding to 21223223132123 its reverse (32123132232212), we get a palindrome (53346355364335).

The spelling of 21223223132123 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-three".