21035384 has 8 divisors (see below), whose sum is σ = 39441360. Its totient is φ = 10517688.

The previous prime is 21035359. The next prime is 21035389. The reversal of 21035384 is 48353012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314704 + ... + 1314719.

It is an arithmetic number, because the mean of its divisors is an integer number (4930170).

Almost surely, 2^21035384 is an apocalyptic number.

It is an amenable number.

21035384 is a deficient number, since it is larger than the sum of its proper divisors (18405976).

21035384 is a wasteful number, since it uses less digits than its factorization.

21035384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629429 (or 2629425 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21035384 is about 4586.4347809600. The cubic root of 21035384 is about 276.0472858841.

Adding to 21035384 its reverse (48353012), we get a palindrome (69388396).

The spelling of 21035384 in words is "twenty-one million, thirty-five thousand, three hundred eighty-four".