21125335 has 32 divisors (see below), whose sum is σ = 32481792. Its totient is φ = 12804480.

The previous prime is 21125329. The next prime is 21125371. The reversal of 21125335 is 53352112.

It is not a de Polignac number, because 21125335 - 2³ = 21125327 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13504 + ... + 14986.

It is an arithmetic number, because the mean of its divisors is an integer number (1015056).

Almost surely, 2^21125335 is an apocalyptic number.

21125335 is a deficient number, since it is larger than the sum of its proper divisors (11356457).

21125335 is a wasteful number, since it uses less digits than its factorization.

21125335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543.

The product of its digits is 900, while the sum is 22.

The square root of 21125335 is about 4596.2305207637. The cubic root of 21125335 is about 276.4402019303.

Adding to 21125335 its reverse (53352112), we get a palindrome (74477447).

It can be divided in two parts, 2112 and 5335, that added together give a palindrome (7447).

The spelling of 21125335 in words is "twenty-one million, one hundred twenty-five thousand, three hundred thirty-five".