21000000000223 has 4 divisors (see below), whose sum is σ = 21000585597808. Its totient is φ = 20999414402640.

The previous prime is 21000000000179. The next prime is 21000000000229. The reversal of 21000000000223 is 32200000000012.

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 21000000000223 - 2⁹ = 20999999999711 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 (21000000000229) 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, 292744998 + ... + 292816723.

It is an arithmetic number, because the mean of its divisors is an integer number (5250146399452).

Almost surely, 2^{21000000000223} is an apocalyptic number.

21000000000223 is a deficient number, since it is larger than the sum of its proper divisors (585597585).

21000000000223 is an equidigital number, since it uses as much as digits as its factorization.

21000000000223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585597584.

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 21000000000223 its reverse (32200000000012), we get a palindrome (53200000000235).

The spelling of 21000000000223 in words is "twenty-one trillion, two hundred twenty-three", and thus it is an aban number.