21104430223 has 2 divisors, whose sum is σ = 21104430224. Its totient is φ = 21104430222.

The previous prime is 21104430161. The next prime is 21104430353. The reversal of 21104430223 is 32203440112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21104430223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21104430194 and 21104430203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104430023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552215111 + 10552215112.

It is an arithmetic number, because the mean of its divisors is an integer number (10552215112).

Almost surely, 2^21104430223 is an apocalyptic number.

21104430223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104430223 is an equidigital number, since it uses as much as digits as its factorization.

21104430223 is an evil number, because the sum of its binary digits is even.

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

Adding to 21104430223 its reverse (32203440112), we get a palindrome (53307870335).

The spelling of 21104430223 in words is "twenty-one billion, one hundred four million, four hundred thirty thousand, two hundred twenty-three".