21320323231223 has 8 divisors (see below), whose sum is σ = 21366414650880. Its totient is φ = 21274233682680.

The previous prime is 21320323231183. The next prime is 21320323231243. The reversal of 21320323231223 is 32213232302312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21320323231223 - 2³⁶ = 21251603754487 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 (21320323231243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23692388 + ... + 24575798.

It is an arithmetic number, because the mean of its divisors is an integer number (2670801831360).

Almost surely, 2^{21320323231223} is an apocalyptic number.

21320323231223 is a deficient number, since it is larger than the sum of its proper divisors (46091419657).

21320323231223 is an equidigital number, since it uses as much as digits as its factorization.

21320323231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935557.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 21320323231223 its reverse (32213232302312), we get a palindrome (53533555533535).

The spelling of 21320323231223 in words is "twenty-one trillion, three hundred twenty billion, three hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty-three".