21036316 has 12 divisors (see below), whose sum is σ = 42072688. Its totient is φ = 9015552.

The previous prime is 21036311. The next prime is 21036341. The reversal of 21036316 is 61363012.

21036316 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036311) 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, 375621 + ... + 375676.

Almost surely, 2^21036316 is an apocalyptic number.

It is an amenable number.

21036316 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21036316 is a wasteful number, since it uses less digits than its factorization.

21036316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751308 (or 751306 counting only the distinct ones).

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

The square root of 21036316 is about 4586.5363838086. The cubic root of 21036316 is about 276.0513627017.

Adding to 21036316 its reverse (61363012), we get a palindrome (82399328).

The spelling of 21036316 in words is "twenty-one million, thirty-six thousand, three hundred sixteen".