21226286 has 8 divisors (see below), whose sum is σ = 33223824. Its totient is φ = 10151680.

The previous prime is 21226277. The next prime is 21226291. The reversal of 21226286 is 68262212.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230675 + ... + 230766.

It is an arithmetic number, because the mean of its divisors is an integer number (4152978).

Almost surely, 2^21226286 is an apocalyptic number.

21226286 is a deficient number, since it is larger than the sum of its proper divisors (11997538).

21226286 is a wasteful number, since it uses less digits than its factorization.

21226286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461466.

The product of its digits is 4608, while the sum is 29.

The square root of 21226286 is about 4607.1993662094. The cubic root of 21226286 is about 276.8798411884.

Adding to 21226286 its reverse (68262212), we get a palindrome (89488498).

It can be divided in two parts, 21226 and 286, that added together give a palindrome (21512).

The spelling of 21226286 in words is "twenty-one million, two hundred twenty-six thousand, two hundred eighty-six".