21734223 has 16 divisors (see below), whose sum is σ = 33927936. Its totient is φ = 12116160.

The previous prime is 21734213. The next prime is 21734261. The reversal of 21734223 is 32243712.

It is not a de Polignac number, because 21734223 - 2⁵ = 21734191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21734193 and 21734202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11761 + ... + 13482.

It is an arithmetic number, because the mean of its divisors is an integer number (2120496).

Almost surely, 2^21734223 is an apocalyptic number.

21734223 is a deficient number, since it is larger than the sum of its proper divisors (12193713).

21734223 is a wasteful number, since it uses less digits than its factorization.

21734223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25294.

The product of its digits is 2016, while the sum is 24.

The square root of 21734223 is about 4661.9977477472. The cubic root of 21734223 is about 279.0709984905.

Adding to 21734223 its reverse (32243712), we get a palindrome (53977935).

The spelling of 21734223 in words is "twenty-one million, seven hundred thirty-four thousand, two hundred twenty-three".