21326236 has 6 divisors (see below), whose sum is σ = 37320920. Its totient is φ = 10663116.

The previous prime is 21326231. The next prime is 21326309. The reversal of 21326236 is 63262312.

It is a happy number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21326236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665776 + ... + 2665783.

Almost surely, 2^21326236 is an apocalyptic number.

It is an amenable number.

21326236 is a deficient number, since it is larger than the sum of its proper divisors (15994684).

21326236 is a wasteful number, since it uses less digits than its factorization.

21326236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331563 (or 5331561 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 21326236 is about 4618.0337807340. The cubic root of 21326236 is about 277.3137499783.

Adding to 21326236 its reverse (63262312), we get a palindrome (84588548).

The spelling of 21326236 in words is "twenty-one million, three hundred twenty-six thousand, two hundred thirty-six".