21312001332223 has 4 divisors (see below), whose sum is σ = 24356572951120. Its totient is φ = 18267429713328.

The previous prime is 21312001332211. The next prime is 21312001332269. The reversal of 21312001332223 is 32223310021312.

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 21312001332223 - 2¹⁷ = 21312001201151 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 (21312001332283) 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, 1522285809438 + ... + 1522285809451.

It is an arithmetic number, because the mean of its divisors is an integer number (6089143237780).

Almost surely, 2^{21312001332223} is an apocalyptic number.

21312001332223 is a deficient number, since it is larger than the sum of its proper divisors (3044571618897).

21312001332223 is an equidigital number, since it uses as much as digits as its factorization.

21312001332223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044571618896.

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

Adding to 21312001332223 its reverse (32223310021312), we get a palindrome (53535311353535).

The spelling of 21312001332223 in words is "twenty-one trillion, three hundred twelve billion, one million, three hundred thirty-two thousand, two hundred twenty-three".