21423120223 has 8 divisors (see below), whose sum is σ = 21700224000. Its totient is φ = 21146164728.

The previous prime is 21423120211. The next prime is 21423120263. The reversal of 21423120223 is 32202132412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21423120223 is a prime.

It is a super-2 number, since 2×21423120223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423120194 and 21423120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423120263) 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, 270078 + ... + 340276.

It is an arithmetic number, because the mean of its divisors is an integer number (2712528000).

Almost surely, 2^21423120223 is an apocalyptic number.

21423120223 is a deficient number, since it is larger than the sum of its proper divisors (277103777).

21423120223 is an equidigital number, since it uses as much as digits as its factorization.

21423120223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74141.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21423120223 its reverse (32202132412), we get a palindrome (53625252635).

The spelling of 21423120223 in words is "twenty-one billion, four hundred twenty-three million, one hundred twenty thousand, two hundred twenty-three".