21065283 has 6 divisors (see below), whose sum is σ = 30427644. Its totient is φ = 14043516.

The previous prime is 21065273. The next prime is 21065287. The reversal of 21065283 is 38256012.

21065283 is a `hidden beast` number, since 2 + 1 + 0 + 652 + 8 + 3 = 666.

It is not a de Polignac number, because 21065283 - 2¹⁰ = 21064259 is a prime.

It is a super-2 number, since 2×21065283² = 887492295740178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21065287) 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 5 ways as a sum of consecutive naturals, for example, 1170285 + ... + 1170302.

It is an arithmetic number, because the mean of its divisors is an integer number (5071274).

Almost surely, 2^21065283 is an apocalyptic number.

21065283 is a deficient number, since it is larger than the sum of its proper divisors (9362361).

21065283 is a wasteful number, since it uses less digits than its factorization.

21065283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340593 (or 2340590 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21065283 is about 4589.6931269966. The cubic root of 21065283 is about 276.1780121317.

The spelling of 21065283 in words is "twenty-one million, sixty-five thousand, two hundred eighty-three".