221000233 has 4 divisors (see below), whose sum is σ = 221302468. Its totient is φ = 220698000.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000233 is 332000122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 332000122 = 2 ⋅166000061.

It can be written as a sum of positive squares in 2 ways, for example, as 219128809 + 1871424 = 14803^2 + 1368^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000233 - 2²¹ = 218903081 is a prime.

It is a super-2 number, since 2×221000233² = 97682205972108578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150018 + ... + 151483.

It is an arithmetic number, because the mean of its divisors is an integer number (55325617).

Almost surely, 2^221000233 is an apocalyptic number.

It is an amenable number.

221000233 is a deficient number, since it is larger than the sum of its proper divisors (302235).

221000233 is an equidigital number, since it uses as much as digits as its factorization.

221000233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302234.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 221000233 is about 14866.0765839545. The cubic root of 221000233 is about 604.5945720755.

Adding to 221000233 its reverse (332000122), we get a palindrome (553000355).

The spelling of 221000233 in words is "two hundred twenty-one million, two hundred thirty-three", and thus it is an aban number.