21348284 has 18 divisors (see below), whose sum is σ = 37767912. Its totient is φ = 10558600.

The previous prime is 21348281. The next prime is 21348289. The reversal of 21348284 is 48284312.

It is a self number, because there is not a number n which added to its sum of digits gives 21348284.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68489 + ... + 68799.

Almost surely, 2^21348284 is an apocalyptic number.

It is an amenable number.

21348284 is a deficient number, since it is larger than the sum of its proper divisors (16419628).

21348284 is a wasteful number, since it uses less digits than its factorization.

21348284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 444 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 21348284 is about 4620.4203271997. The cubic root of 21348284 is about 277.4092834443.

The spelling of 21348284 in words is "twenty-one million, three hundred forty-eight thousand, two hundred eighty-four".