21324226 has 16 divisors (see below), whose sum is σ = 39879360. Its totient is φ = 8308080.

The previous prime is 21324221. The next prime is 21324227. The reversal of 21324226 is 62242312.

It is a super-2 number, since 2×21324226² = 909445228998152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21324197 and 21324206.

It is not an unprimeable number, because it can be changed into a prime (21324221) 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, 69081 + ... + 69388.

It is an arithmetic number, because the mean of its divisors is an integer number (2492460).

Almost surely, 2^21324226 is an apocalyptic number.

21324226 is a deficient number, since it is larger than the sum of its proper divisors (18555134).

21324226 is a wasteful number, since it uses less digits than its factorization.

21324226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138489.

The product of its digits is 1152, while the sum is 22.

The square root of 21324226 is about 4617.8161505196. The cubic root of 21324226 is about 277.3050374212.

Adding to 21324226 its reverse (62242312), we get a palindrome (83566538).

The spelling of 21324226 in words is "twenty-one million, three hundred twenty-four thousand, two hundred twenty-six".