221425233 has 8 divisors (see below), whose sum is σ = 296764128. Its totient is φ = 146851584.

The previous prime is 221425199. The next prime is 221425241. The reversal of 221425233 is 332524122.

221425233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221425233 - 2²⁰ = 220376657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221425273) 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, 190635 + ... + 191792.

It is an arithmetic number, because the mean of its divisors is an integer number (37095516).

Almost surely, 2^221425233 is an apocalyptic number.

It is an amenable number.

221425233 is a deficient number, since it is larger than the sum of its proper divisors (75338895).

221425233 is a wasteful number, since it uses less digits than its factorization.

221425233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382623.

The product of its digits is 2880, while the sum is 24.

The square root of 221425233 is about 14880.3640076444. The cubic root of 221425233 is about 604.9818841193.

Adding to 221425233 its reverse (332524122), we get a palindrome (553949355).

The spelling of 221425233 in words is "two hundred twenty-one million, four hundred twenty-five thousand, two hundred thirty-three".