21123326 has 16 divisors (see below), whose sum is σ = 38117760. Its totient is φ = 8576280.

The previous prime is 21123313. The next prime is 21123331. The reversal of 21123326 is 62332112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21123298 and 21123307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39440 + ... + 39971.

It is an arithmetic number, because the mean of its divisors is an integer number (2382360).

Almost surely, 2^21123326 is an apocalyptic number.

21123326 is a deficient number, since it is larger than the sum of its proper divisors (16994434).

21123326 is a wasteful number, since it uses less digits than its factorization.

21123326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79439.

The product of its digits is 432, while the sum is 20.

The square root of 21123326 is about 4596.0119669122. The cubic root of 21123326 is about 276.4314385825.

Adding to 21123326 its reverse (62332112), we get a palindrome (83455438).

The spelling of 21123326 in words is "twenty-one million, one hundred twenty-three thousand, three hundred twenty-six".