21006326 has 24 divisors (see below), whose sum is σ = 35226912. Its totient is φ = 9385200.

The previous prime is 21006311. The next prime is 21006329. The reversal of 21006326 is 62360012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21006298 and 21006307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14051 + ... + 15473.

It is an arithmetic number, because the mean of its divisors is an integer number (1467788).

Almost surely, 2^21006326 is an apocalyptic number.

21006326 is a deficient number, since it is larger than the sum of its proper divisors (14220586).

21006326 is a wasteful number, since it uses less digits than its factorization.

21006326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1497 counting only the distinct ones).

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

The square root of 21006326 is about 4583.2658661701. The cubic root of 21006326 is about 275.9201179590.

Adding to 21006326 its reverse (62360012), we get a palindrome (83366338).

The spelling of 21006326 in words is "twenty-one million, six thousand, three hundred twenty-six".