221123266 has 16 divisors (see below), whose sum is σ = 408227904. Its totient is φ = 87477264.

The previous prime is 221123251. The next prime is 221123269. The reversal of 221123266 is 662321122.

It is a self number, because there is not a number n which added to its sum of digits gives 221123266.

It is not an unprimeable number, because it can be changed into a prime (221123269) 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, 607300 + ... + 607663.

It is an arithmetic number, because the mean of its divisors is an integer number (25514244).

Almost surely, 2^221123266 is an apocalyptic number.

221123266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221123266 is a deficient number, since it is larger than the sum of its proper divisors (187104638).

221123266 is a wasteful number, since it uses less digits than its factorization.

221123266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214985.

The product of its digits is 1728, while the sum is 25.

The square root of 221123266 is about 14870.2140536039. The cubic root of 221123266 is about 604.7067458405.

Adding to 221123266 its reverse (662321122), we get a palindrome (883444388).

The spelling of 221123266 in words is "two hundred twenty-one million, one hundred twenty-three thousand, two hundred sixty-six".