21226263 has 8 divisors (see below), whose sum is σ = 29532288. Its totient is φ = 13535544.

The previous prime is 21226241. The next prime is 21226277. The reversal of 21226263 is 36262212.

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

It is not a de Polignac number, because 21226263 - 2⁶ = 21226199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 153745 + ... + 153882.

It is an arithmetic number, because the mean of its divisors is an integer number (3691536).

Almost surely, 2^21226263 is an apocalyptic number.

21226263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21226263 is a deficient number, since it is larger than the sum of its proper divisors (8306025).

21226263 is a wasteful number, since it uses less digits than its factorization.

21226263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307653.

The product of its digits is 1728, while the sum is 24.

The square root of 21226263 is about 4607.1968701153. The cubic root of 21226263 is about 276.8797411829.

Adding to 21226263 its reverse (36262212), we get a palindrome (57488475).

It can be divided in two parts, 2122 and 6263, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 21226263 in words is "twenty-one million, two hundred twenty-six thousand, two hundred sixty-three".