221242033 has 4 divisors (see below), whose sum is σ = 221272420. Its totient is φ = 221211648.

The previous prime is 221242003. The next prime is 221242039. The reversal of 221242033 is 330242122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 116035984 + 105206049 = 10772^2 + 10257^2 .

It is a cyclic number.

It is not a de Polignac number, because 221242033 - 2²⁵ = 187687601 is a prime.

It is a super-3 number, since 3×221242033³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221242033.

It is not an unprimeable number, because it can be changed into a prime (221242039) 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, 2953 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (55318105).

Almost surely, 2^221242033 is an apocalyptic number.

It is an amenable number.

221242033 is a deficient number, since it is larger than the sum of its proper divisors (30387).

221242033 is a wasteful number, since it uses less digits than its factorization.

221242033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30386.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221242033 is about 14874.2069704573. The cubic root of 221242033 is about 604.8149906716.

Adding to 221242033 its reverse (330242122), we get a palindrome (551484155).

The spelling of 221242033 in words is "two hundred twenty-one million, two hundred forty-two thousand, thirty-three".