21630226 has 8 divisors (see below), whose sum is σ = 32995440. Its totient is φ = 10631748.

The previous prime is 21630223. The next prime is 21630229. The reversal of 21630226 is 62203612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21630223) and next prime (21630229).

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

It is a super-2 number, since 2×21630226² = 935733353622152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21630197 and 21630206.

It is not an unprimeable number, because it can be changed into a prime (21630223) 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, 91536 + ... + 91771.

It is an arithmetic number, because the mean of its divisors is an integer number (4124430).

Almost surely, 2^21630226 is an apocalyptic number.

21630226 is a deficient number, since it is larger than the sum of its proper divisors (11365214).

21630226 is a wasteful number, since it uses less digits than its factorization.

21630226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183368.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21630226 is about 4650.8306784917. The cubic root of 21630226 is about 278.6251737885.

Adding to 21630226 its reverse (62203612), we get a palindrome (83833838).

The spelling of 21630226 in words is "twenty-one million, six hundred thirty thousand, two hundred twenty-six".