21223013 has 8 divisors (see below), whose sum is σ = 24371520. Its totient is φ = 18103680.

The previous prime is 21223009. The next prime is 21223051. The reversal of 21223013 is 31032212.

It is a happy number.

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

It is not a de Polignac number, because 21223013 - 2² = 21223009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223073) 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, 5708 + ... + 8661.

It is an arithmetic number, because the mean of its divisors is an integer number (3046440).

Almost surely, 2^21223013 is an apocalyptic number.

It is an amenable number.

21223013 is a deficient number, since it is larger than the sum of its proper divisors (3148507).

21223013 is a wasteful number, since it uses less digits than its factorization.

21223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14587.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21223013 is about 4606.8441475700. The cubic root of 21223013 is about 276.8656092387.

Adding to 21223013 its reverse (31032212), we get a palindrome (52255225).

The spelling of 21223013 in words is "twenty-one million, two hundred twenty-three thousand, thirteen".