21223123310203 has 4 divisors (see below), whose sum is σ = 21223406771928. Its totient is φ = 21222839848480.

The previous prime is 21223123310201. The next prime is 21223123310231. The reversal of 21223123310203 is 30201332132212.

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 21223123310203 - 2¹ = 21223123310201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223123310201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141618526 + ... + 141768307.

It is an arithmetic number, because the mean of its divisors is an integer number (5305851692982).

Almost surely, 2^{21223123310203} is an apocalyptic number.

21223123310203 is a deficient number, since it is larger than the sum of its proper divisors (283461725).

21223123310203 is an equidigital number, since it uses as much as digits as its factorization.

21223123310203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283461724.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21223123310203 its reverse (30201332132212), we get a palindrome (51424455442415).

The spelling of 21223123310203 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred twenty-three million, three hundred ten thousand, two hundred three".