21122453532223 has 4 divisors (see below), whose sum is σ = 21145437704560. Its totient is φ = 21099469359888.

The previous prime is 21122453532209. The next prime is 21122453532269. The reversal of 21122453532223 is 32223535422112.

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 21122453532223 - 2³⁷ = 20985014578751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122453532283) 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, 11492084790 + ... + 11492086627.

It is an arithmetic number, because the mean of its divisors is an integer number (5286359426140).

Almost surely, 2^{21122453532223} is an apocalyptic number.

21122453532223 is a deficient number, since it is larger than the sum of its proper divisors (22984172337).

21122453532223 is an equidigital number, since it uses as much as digits as its factorization.

21122453532223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22984172336.

The product of its digits is 172800, while the sum is 37.

Adding to 21122453532223 its reverse (32223535422112), we get a palindrome (53345988954335).

The spelling of 21122453532223 in words is "twenty-one trillion, one hundred twenty-two billion, four hundred fifty-three million, five hundred thirty-two thousand, two hundred twenty-three".