21345335 has 16 divisors (see below), whose sum is σ = 28238112. Its totient is φ = 15360000.

The previous prime is 21345287. The next prime is 21345347. The reversal of 21345335 is 53354312.

It is not a de Polignac number, because 21345335 - 2¹⁰ = 21344311 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 3335 + ... + 7335.

It is an arithmetic number, because the mean of its divisors is an integer number (1764882).

Almost surely, 2^21345335 is an apocalyptic number.

21345335 is a deficient number, since it is larger than the sum of its proper divisors (6892777).

21345335 is a wasteful number, since it uses less digits than its factorization.

21345335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114.

The product of its digits is 5400, while the sum is 26.

The square root of 21345335 is about 4620.1011893680. The cubic root of 21345335 is about 277.3965093083.

Adding to 21345335 its reverse (53354312), we get a palindrome (74699647).

The spelling of 21345335 in words is "twenty-one million, three hundred forty-five thousand, three hundred thirty-five".