21301384 has 16 divisors (see below), whose sum is σ = 43012620. Its totient is φ = 9831360.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301384 is 48310312.

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 49284 = 4610^2 + 222^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102307 + ... + 102514.

Almost surely, 2^21301384 is an apocalyptic number.

It is an amenable number.

21301384 is an abundant number, since it is smaller than the sum of its proper divisors (21711236).

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

21301384 is a wasteful number, since it uses less digits than its factorization.

21301384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204840 (or 204836 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21301384 is about 4615.3422408311. The cubic root of 21301384 is about 277.2059878755.

Adding to 21301384 its reverse (48310312), we get a palindrome (69611696).

The spelling of 21301384 in words is "twenty-one million, three hundred one thousand, three hundred eighty-four".