21365282 has 4 divisors (see below), whose sum is σ = 32047926. Its totient is φ = 10682640.

The previous prime is 21365269. The next prime is 21365299. The reversal of 21365282 is 28256312.

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

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 8755681 = 3551^2 + 2959^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341319 + ... + 5341322.

Almost surely, 2^21365282 is an apocalyptic number.

21365282 is a deficient number, since it is larger than the sum of its proper divisors (10682644).

21365282 is a wasteful number, since it uses less digits than its factorization.

21365282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682643.

The product of its digits is 5760, while the sum is 29.

The square root of 21365282 is about 4622.2594042308. The cubic root of 21365282 is about 277.4828904853.

The spelling of 21365282 in words is "twenty-one million, three hundred sixty-five thousand, two hundred eighty-two".