21986282 has 4 divisors (see below), whose sum is σ = 32979426. Its totient is φ = 10993140.

The previous prime is 21986273. The next prime is 21986309. The reversal of 21986282 is 28268912.

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., 18567481 + 3418801 = 4309^2 + 1849^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5496569 + ... + 5496572.

Almost surely, 2^21986282 is an apocalyptic number.

21986282 is a deficient number, since it is larger than the sum of its proper divisors (10993144).

21986282 is a wasteful number, since it uses less digits than its factorization.

21986282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10993143.

The product of its digits is 27648, while the sum is 38.

The square root of 21986282 is about 4688.9531880794. The cubic root of 21986282 is about 280.1456809933.

The spelling of 21986282 in words is "twenty-one million, nine hundred eighty-six thousand, two hundred eighty-two".