21336016 has 40 divisors (see below), whose sum is σ = 45212384. Its totient is φ = 9694080.

The previous prime is 21336001. The next prime is 21336017. The reversal of 21336016 is 61063312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21336017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13171 + ... + 14701.

Almost surely, 2^21336016 is an apocalyptic number.

21336016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21336016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22606192).

21336016 is an abundant number, since it is smaller than the sum of its proper divisors (23876368).

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

21336016 is a wasteful number, since it uses less digits than its factorization.

21336016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21336016 is about 4619.0925515733. The cubic root of 21336016 is about 277.3561346104.

Adding to 21336016 its reverse (61063312), we get a palindrome (82399328).

The spelling of 21336016 in words is "twenty-one million, three hundred thirty-six thousand, sixteen".