21160255 has 4 divisors (see below), whose sum is σ = 25392312. Its totient is φ = 16928200.

The previous prime is 21160231. The next prime is 21160261. The reversal of 21160255 is 55206112.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21160255 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 2116021 + ... + 2116030.

It is an arithmetic number, because the mean of its divisors is an integer number (6348078).

Almost surely, 2^21160255 is an apocalyptic number.

21160255 is a deficient number, since it is larger than the sum of its proper divisors (4232057).

21160255 is an equidigital number, since it uses as much as digits as its factorization.

21160255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232056.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 21160255 is about 4600.0277173078. The cubic root of 21160255 is about 276.5924358522.

Adding to 21160255 its reverse (55206112), we get a palindrome (76366367).

The spelling of 21160255 in words is "twenty-one million, one hundred sixty thousand, two hundred fifty-five".