21255283 has 8 divisors (see below), whose sum is σ = 24419168. Its totient is φ = 18123264.

The previous prime is 21255277. The next prime is 21255293. The reversal of 21255283 is 38255212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21255283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21255203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6516 + ... + 9217.

It is an arithmetic number, because the mean of its divisors is an integer number (3052396).

Almost surely, 2^21255283 is an apocalyptic number.

21255283 is a deficient number, since it is larger than the sum of its proper divisors (3163885).

21255283 is a wasteful number, since it uses less digits than its factorization.

21255283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15933.

The product of its digits is 4800, while the sum is 28.

The square root of 21255283 is about 4610.3452148402. The cubic root of 21255283 is about 277.0058646727.

The spelling of 21255283 in words is "twenty-one million, two hundred fifty-five thousand, two hundred eighty-three".