21536316 has 36 divisors (see below), whose sum is σ = 55770624. Its totient is φ = 7003200.

The previous prime is 21536287. The next prime is 21536321. The reversal of 21536316 is 61363512.

21536316 is a `hidden beast` number, since 21 + 5 + 3 + 631 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21536316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5820 + ... + 8771.

It is an arithmetic number, because the mean of its divisors is an integer number (1549184).

Almost surely, 2^21536316 is an apocalyptic number.

It is an amenable number.

21536316 is an abundant number, since it is smaller than the sum of its proper divisors (34234308).

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

21536316 is a wasteful number, since it uses less digits than its factorization.

21536316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14642 (or 14637 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 21536316 is about 4640.7236504666. The cubic root of 21536316 is about 278.2213615684.

Adding to 21536316 its reverse (61363512), we get a palindrome (82899828).

The spelling of 21536316 in words is "twenty-one million, five hundred thirty-six thousand, three hundred sixteen".