21313355 has 8 divisors (see below), whose sum is σ = 29229792. Its totient is φ = 14614848.

The previous prime is 21313349. The next prime is 21313361. The reversal of 21313355 is 55331312.

It is an interprime number because it is at equal distance from previous prime (21313349) and next prime (21313361).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21313355 - 2¹² = 21309259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21313355.

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 7 ways as a sum of consecutive naturals, for example, 304442 + ... + 304511.

It is an arithmetic number, because the mean of its divisors is an integer number (3653724).

Almost surely, 2^21313355 is an apocalyptic number.

21313355 is a deficient number, since it is larger than the sum of its proper divisors (7916437).

21313355 is an equidigital number, since it uses as much as digits as its factorization.

21313355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608965.

The product of its digits is 1350, while the sum is 23.

The square root of 21313355 is about 4616.6389289179. The cubic root of 21313355 is about 277.2579064338.

Adding to 21313355 its reverse (55331312), we get a palindrome (76644667).

The spelling of 21313355 in words is "twenty-one million, three hundred thirteen thousand, three hundred fifty-five".