21109044223 has 2 divisors, whose sum is σ = 21109044224. Its totient is φ = 21109044222.

The previous prime is 21109044199. The next prime is 21109044239. The reversal of 21109044223 is 32244090112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21109044223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21109044191 and 21109044200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21109074223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10554522111 + 10554522112.

It is an arithmetic number, because the mean of its divisors is an integer number (10554522112).

Almost surely, 2^21109044223 is an apocalyptic number.

21109044223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21109044223 is an equidigital number, since it uses as much as digits as its factorization.

21109044223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21109044223 in words is "twenty-one billion, one hundred nine million, forty-four thousand, two hundred twenty-three".