21313335 has 16 divisors (see below), whose sum is σ = 34164576. Its totient is φ = 11346048.

The previous prime is 21313333. The next prime is 21313343. The reversal of 21313335 is 53331312.

It is not a de Polignac number, because 21313335 - 2¹ = 21313333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10417 + ... + 12293.

It is an arithmetic number, because the mean of its divisors is an integer number (2135286).

Almost surely, 2^21313335 is an apocalyptic number.

21313335 is a deficient number, since it is larger than the sum of its proper divisors (12851241).

21313335 is a wasteful number, since it uses less digits than its factorization.

21313335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642.

The product of its digits is 810, while the sum is 21.

The square root of 21313335 is about 4616.6367628394. The cubic root of 21313335 is about 277.2578197095.

Adding to 21313335 its reverse (53331312), we get a palindrome (74644647).

The spelling of 21313335 in words is "twenty-one million, three hundred thirteen thousand, three hundred thirty-five".