21044232223 has 6 divisors (see below), whose sum is σ = 24480025296. Its totient is φ = 18037913292.

The previous prime is 21044232217. The next prime is 21044232229. The reversal of 21044232223 is 32223244012.

It is an interprime number because it is at equal distance from previous prime (21044232217) and next prime (21044232229).

It is a de Polignac number, because none of the positive numbers 2^k-21044232223 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 (21044232229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214737015 + ... + 214737112.

It is an arithmetic number, because the mean of its divisors is an integer number (4080004216).

Almost surely, 2^21044232223 is an apocalyptic number.

21044232223 is a deficient number, since it is larger than the sum of its proper divisors (3435793073).

21044232223 is an equidigital number, since it uses as much as digits as its factorization.

21044232223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429474141 (or 429474134 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21044232223 its reverse (32223244012), we get a palindrome (53267476235).

The spelling of 21044232223 in words is "twenty-one billion, forty-four million, two hundred thirty-two thousand, two hundred twenty-three".