21329836 has 12 divisors (see below), whose sum is σ = 40720680. Its totient is φ = 9695360.

The previous prime is 21329827. The next prime is 21329839. The reversal of 21329836 is 63892312.

It is a happy number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21329839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242341 + ... + 242428.

It is an arithmetic number, because the mean of its divisors is an integer number (3393390).

Almost surely, 2^21329836 is an apocalyptic number.

It is an amenable number.

21329836 is a deficient number, since it is larger than the sum of its proper divisors (19390844).

21329836 is a wasteful number, since it uses less digits than its factorization.

21329836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484784 (or 484782 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21329836 is about 4618.4235405601. The cubic root of 21329836 is about 277.3293531901.

The spelling of 21329836 in words is "twenty-one million, three hundred twenty-nine thousand, eight hundred thirty-six".