21025335 has 16 divisors (see below), whose sum is σ = 35103744. Its totient is φ = 10725792.

The previous prime is 21025321. The next prime is 21025339. The reversal of 21025335 is 53352012.

It is not a de Polignac number, because 21025335 - 2¹¹ = 21023287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30127 + ... + 30816.

It is an arithmetic number, because the mean of its divisors is an integer number (2193984).

Almost surely, 2^21025335 is an apocalyptic number.

21025335 is a deficient number, since it is larger than the sum of its proper divisors (14078409).

21025335 is a wasteful number, since it uses less digits than its factorization.

21025335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60974.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21025335 is about 4585.3391368578. The cubic root of 21025335 is about 276.0033212161.

Adding to 21025335 its reverse (53352012), we get a palindrome (74377347).

The spelling of 21025335 in words is "twenty-one million, twenty-five thousand, three hundred thirty-five".