221235 has 32 divisors (see below), whose sum is σ = 422400. Its totient is φ = 98784.

The previous prime is 221233. The next prime is 221239. The reversal of 221235 is 532122.

It is not a de Polignac number, because 221235 - 2¹ = 221233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a d-powerful number, because it can be written as 2 + 2¹³ + 2¹⁵ + 1 + 3¹¹ + 5⁵ .

221235 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (221233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5124 + ... + 5166.

It is an arithmetic number, because the mean of its divisors is an integer number (13200).

2²²¹²³⁵ is an apocalyptic number.

221235 is a deficient number, since it is larger than the sum of its proper divisors (201165).

221235 is an equidigital number, since it uses as much as digits as its factorization.

221235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 58 counting only the distinct ones).

The product of its digits is 120, while the sum is 15.

The square root of 221235 is about 470.3562479653. The cubic root of 221235 is about 60.4808581840.

Adding to 221235 its reverse (532122), we get a palindrome (753357).

The spelling of 221235 in words is "two hundred twenty-one thousand, two hundred thirty-five".