21123444332223 has 6 divisors (see below), whose sum is σ = 30511641813224. Its totient is φ = 14082296221476.

The previous prime is 21123444332173. The next prime is 21123444332239. The reversal of 21123444332223 is 32223344432112.

21123444332223 is a `hidden beast` number, since 21 + 1 + 2 + 344 + 43 + 32 + 223 = 666.

It is not a de Polignac number, because 21123444332223 - 2³² = 21119149364927 is a prime.

It is a super-2 number, since 2×21123444332223² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123444332623) 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, 1173524685115 + ... + 1173524685132.

Almost surely, 2^{21123444332223} is an apocalyptic number.

21123444332223 is a deficient number, since it is larger than the sum of its proper divisors (9388197481001).

21123444332223 is a wasteful number, since it uses less digits than its factorization.

21123444332223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347049370253 (or 2347049370250 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

Adding to 21123444332223 its reverse (32223344432112), we get a palindrome (53346788764335).

The spelling of 21123444332223 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred forty-four million, three hundred thirty-two thousand, two hundred twenty-three".