21126326 has 16 divisors (see below), whose sum is σ = 35305200. Its totient is φ = 9414048.

The previous prime is 21126317. The next prime is 21126337. The reversal of 21126326 is 62362112.

It is a Curzon number.

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, 13256 + ... + 14763.

It is an arithmetic number, because the mean of its divisors is an integer number (2206575).

Almost surely, 2^21126326 is an apocalyptic number.

21126326 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21126326 is a deficient number, since it is larger than the sum of its proper divisors (14178874).

21126326 is a wasteful number, since it uses less digits than its factorization.

21126326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28063.

The product of its digits is 864, while the sum is 23.

The square root of 21126326 is about 4596.3383252324. The cubic root of 21126326 is about 276.4445245120. Note that the first 3 decimals are identical.

Adding to 21126326 its reverse (62362112), we get a palindrome (83488438).

The spelling of 21126326 in words is "twenty-one million, one hundred twenty-six thousand, three hundred twenty-six".