21223626 has 8 divisors (see below), whose sum is σ = 42447264. Its totient is φ = 7074540.

The previous prime is 21223619. The next prime is 21223637. The reversal of 21223626 is 62632212.

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

21223626 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21223596 and 21223605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768630 + ... + 1768641.

It is an arithmetic number, because the mean of its divisors is an integer number (5305908).

Almost surely, 2^21223626 is an apocalyptic number.

21223626 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223626 is a wasteful number, since it uses less digits than its factorization.

21223626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537276.

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

The square root of 21223626 is about 4606.9106785350. The cubic root of 21223626 is about 276.8682748512.

Adding to 21223626 its reverse (62632212), we get a palindrome (83855838).

The spelling of 21223626 in words is "twenty-one million, two hundred twenty-three thousand, six hundred twenty-six".