221207026 has 8 divisors (see below), whose sum is σ = 351328860. Its totient is φ = 104097408.

The previous prime is 221207011. The next prime is 221207027. The reversal of 221207026 is 620702122.

It can be written as a sum of positive squares in 2 ways, for example, as 184009225 + 37197801 = 13565^2 + 6099^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 221206988 and 221207006.

It is not an unprimeable number, because it can be changed into a prime (221207027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3253011 + ... + 3253078.

Almost surely, 2^221207026 is an apocalyptic number.

221207026 is a deficient number, since it is larger than the sum of its proper divisors (130121834).

221207026 is a wasteful number, since it uses less digits than its factorization.

221207026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6506108.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 221207026 is about 14873.0301552844. The cubic root of 221207026 is about 604.7830891459.

Adding to 221207026 its reverse (620702122), we get a palindrome (841909148).

The spelling of 221207026 in words is "two hundred twenty-one million, two hundred seven thousand, twenty-six".