21113226 has 12 divisors (see below), whose sum is σ = 45745362. Its totient is φ = 7037736.

The previous prime is 21113221. The next prime is 21113231. The reversal of 21113226 is 62231112.

It is an interprime number because it is at equal distance from previous prime (21113221) and next prime (21113231).

It can be written as a sum of positive squares in only one way, i.e., 20115225 + 998001 = 4485^2 + 999^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1172957 = 21113226 / (2 + 1 + 1 + 1 + 3 + 2 + 2 + 6).

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 = 21113199 and 21113208.

It is not an unprimeable number, because it can be changed into a prime (21113221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586461 + ... + 586496.

Almost surely, 2^21113226 is an apocalyptic number.

21113226 is an abundant number, since it is smaller than the sum of its proper divisors (24632136).

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

21113226 is a wasteful number, since it uses less digits than its factorization.

21113226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172965 (or 1172962 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 21113226 is about 4594.9130568488. The cubic root of 21113226 is about 276.3873735107.

Adding to 21113226 its reverse (62231112), we get a palindrome (83344338).

The spelling of 21113226 in words is "twenty-one million, one hundred thirteen thousand, two hundred twenty-six".