21036284 has 6 divisors (see below), whose sum is σ = 36813504. Its totient is φ = 10518140.

The previous prime is 21036271. The next prime is 21036289. The reversal of 21036284 is 48263012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629532 + ... + 2629539.

It is an arithmetic number, because the mean of its divisors is an integer number (6135584).

Almost surely, 2^21036284 is an apocalyptic number.

It is an amenable number.

21036284 is a deficient number, since it is larger than the sum of its proper divisors (15777220).

21036284 is a wasteful number, since it uses less digits than its factorization.

21036284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259075 (or 5259073 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21036284 is about 4586.5328953361. The cubic root of 21036284 is about 276.0512227271.

Adding to 21036284 its reverse (48263012), we get a palindrome (69299296).

The spelling of 21036284 in words is "twenty-one million, thirty-six thousand, two hundred eighty-four".