21282286 has 4 divisors (see below), whose sum is σ = 31923432. Its totient is φ = 10641142.

The previous prime is 21282269. The next prime is 21282301. The reversal of 21282286 is 68228212.

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

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5320570 + ... + 5320573.

It is an arithmetic number, because the mean of its divisors is an integer number (7980858).

Almost surely, 2^21282286 is an apocalyptic number.

21282286 is a deficient number, since it is larger than the sum of its proper divisors (10641146).

21282286 is a wasteful number, since it uses less digits than its factorization.

21282286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10641145.

The product of its digits is 6144, while the sum is 31.

The square root of 21282286 is about 4613.2728078881. The cubic root of 21282286 is about 277.1231190362.

The spelling of 21282286 in words is "twenty-one million, two hundred eighty-two thousand, two hundred eighty-six".