21126835 has 16 divisors (see below), whose sum is σ = 27000000. Its totient is φ = 15814656.

The previous prime is 21126827. The next prime is 21126851. The reversal of 21126835 is 53862112.

It is a cyclic number.

It is not a de Polignac number, because 21126835 - 2³ = 21126827 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 16291 + ... + 17539.

It is an arithmetic number, because the mean of its divisors is an integer number (1687500).

Almost surely, 2^21126835 is an apocalyptic number.

21126835 is a deficient number, since it is larger than the sum of its proper divisors (5873165).

21126835 is a wasteful number, since it uses less digits than its factorization.

21126835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470.

The product of its digits is 2880, while the sum is 28.

The square root of 21126835 is about 4596.3936950614. The cubic root of 21126835 is about 276.4467446351.

Adding to 21126835 its reverse (53862112), we get a palindrome (74988947).

The spelling of 21126835 in words is "twenty-one million, one hundred twenty-six thousand, eight hundred thirty-five".