21363206 has 4 divisors (see below), whose sum is σ = 32044812. Its totient is φ = 10681602.

The previous prime is 21363193. The next prime is 21363253. The reversal of 21363206 is 60236312.

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

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, 5340800 + ... + 5340803.

It is an arithmetic number, because the mean of its divisors is an integer number (8011203).

Almost surely, 2^21363206 is an apocalyptic number.

21363206 is a deficient number, since it is larger than the sum of its proper divisors (10681606).

21363206 is a wasteful number, since it uses less digits than its factorization.

21363206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681605.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 21363206 is about 4622.0348332742. The cubic root of 21363206 is about 277.4739028024.

Adding to 21363206 its reverse (60236312), we get a palindrome (81599518).

The spelling of 21363206 in words is "twenty-one million, three hundred sixty-three thousand, two hundred six".