21227226 has 8 divisors (see below), whose sum is σ = 42454464. Its totient is φ = 7075740.

The previous prime is 21227209. The next prime is 21227243. The reversal of 21227226 is 62272212.

It is an interprime number because it is at equal distance from previous prime (21227209) and next prime (21227243).

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

21227226 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21227196 and 21227205.

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, 1768930 + ... + 1768941.

It is an arithmetic number, because the mean of its divisors is an integer number (5306808).

Almost surely, 2^21227226 is an apocalyptic number.

21227226 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.

21227226 is a wasteful number, since it uses less digits than its factorization.

21227226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537876.

The product of its digits is 1344, while the sum is 24.

The square root of 21227226 is about 4607.3013793326. The cubic root of 21227226 is about 276.8839283096.

Adding to 21227226 its reverse (62272212), we get a palindrome (83499438).

The spelling of 21227226 in words is "twenty-one million, two hundred twenty-seven thousand, two hundred twenty-six".