21336312 has 32 divisors (see below), whose sum is σ = 53988480. Its totient is φ = 7025760.

The previous prime is 21336307. The next prime is 21336317. The reversal of 21336312 is 21363312.

It is an interprime number because it is at equal distance from previous prime (21336307) and next prime (21336317).

It is a super-3 number, since 3×21336312³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21336317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3364 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (1687140).

Almost surely, 2^21336312 is an apocalyptic number.

It is an amenable number.

21336312 is an abundant number, since it is smaller than the sum of its proper divisors (32652168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21336312 is a wasteful number, since it uses less digits than its factorization.

21336312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10803 (or 10799 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 21336312 is about 4619.1245923876. The cubic root of 21336312 is about 277.3574172153.

Adding to 21336312 its reverse (21363312), we get a palindrome (42699624).

Subtracting 21336312 from its reverse (21363312), we obtain a cube (27000 = 30³).

The spelling of 21336312 in words is "twenty-one million, three hundred thirty-six thousand, three hundred twelve".