21226363 has 4 divisors (see below), whose sum is σ = 22343560. Its totient is φ = 20109168.

The previous prime is 21226327. The next prime is 21226367. The reversal of 21226363 is 36362212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21226363 - 2⁹ = 21225851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558570 + ... + 558607.

It is an arithmetic number, because the mean of its divisors is an integer number (5585890).

Almost surely, 2^21226363 is an apocalyptic number.

21226363 is a deficient number, since it is larger than the sum of its proper divisors (1117197).

21226363 is a wasteful number, since it uses less digits than its factorization.

21226363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117196.

The product of its digits is 2592, while the sum is 25.

The square root of 21226363 is about 4607.2077226884. The cubic root of 21226363 is about 276.8801759891.

Adding to 21226363 its reverse (36362212), we get a palindrome (57588575).

The spelling of 21226363 in words is "twenty-one million, two hundred twenty-six thousand, three hundred sixty-three".