21223263 has 8 divisors (see below), whose sum is σ = 28325808. Its totient is φ = 14134784.

The previous prime is 21223261. The next prime is 21223277. The reversal of 21223263 is 36232212.

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

It is a cyclic number.

It is not a de Polignac number, because 21223263 - 2¹ = 21223261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (3540726).

Almost surely, 2^21223263 is an apocalyptic number.

21223263 is a deficient number, since it is larger than the sum of its proper divisors (7102545).

21223263 is a wasteful number, since it uses less digits than its factorization.

21223263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7033.

The product of its digits is 864, while the sum is 21.

The square root of 21223263 is about 4606.8712810323. The cubic root of 21223263 is about 276.8666963626.

Adding to 21223263 its reverse (36232212), we get a palindrome (57455475).

The spelling of 21223263 in words is "twenty-one million, two hundred twenty-three thousand, two hundred sixty-three".