221012226 has 40 divisors (see below), whose sum is σ = 504594684. Its totient is φ = 72277920.

The previous prime is 221012201. The next prime is 221012227. The reversal of 221012226 is 622210122.

It can be written as a sum of positive squares in 2 ways, for example, as 210221001 + 10791225 = 14499^2 + 3285^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221012199 and 221012208.

It is not an unprimeable number, because it can be changed into a prime (221012227) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4285 + ... + 21456.

Almost surely, 2^221012226 is an apocalyptic number.

221012226 is an abundant number, since it is smaller than the sum of its proper divisors (283582458).

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

221012226 is a wasteful number, since it uses less digits than its factorization.

221012226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25808 (or 25799 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 221012226 is about 14866.4799465105. The cubic root of 221012226 is about 604.6055083710.

Adding to 221012226 its reverse (622210122), we get a palindrome (843222348).

The spelling of 221012226 in words is "two hundred twenty-one million, twelve thousand, two hundred twenty-six".