21036835 has 8 divisors (see below), whose sum is σ = 26341920. Its totient is φ = 16097664.

The previous prime is 21036833. The next prime is 21036877. The reversal of 21036835 is 53863012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21036835 - 2¹ = 21036833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21036833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91350 + ... + 91579.

It is an arithmetic number, because the mean of its divisors is an integer number (3292740).

Almost surely, 2^21036835 is an apocalyptic number.

21036835 is a deficient number, since it is larger than the sum of its proper divisors (5305085).

21036835 is a wasteful number, since it uses less digits than its factorization.

21036835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182957.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21036835 is about 4586.5929621016. The cubic root of 21036835 is about 276.0536328945.

Adding to 21036835 its reverse (53863012), we get a palindrome (74899847).

The spelling of 21036835 in words is "twenty-one million, thirty-six thousand, eight hundred thirty-five".