21162226 has 4 divisors (see below), whose sum is σ = 31743342. Its totient is φ = 10581112.

The previous prime is 21162217. The next prime is 21162247. The reversal of 21162226 is 62226112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 2886601 = 4275^2 + 1699^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21162197 and 21162206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290555 + ... + 5290558.

Almost surely, 2^21162226 is an apocalyptic number.

21162226 is a deficient number, since it is larger than the sum of its proper divisors (10581116).

21162226 is a wasteful number, since it uses less digits than its factorization.

21162226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581115.

The product of its digits is 576, while the sum is 22.

The square root of 21162226 is about 4600.2419501587. The cubic root of 21162226 is about 276.6010234419.

Adding to 21162226 its reverse (62226112), we get a palindrome (83388338).

The spelling of 21162226 in words is "twenty-one million, one hundred sixty-two thousand, two hundred twenty-six".