235240221 has 4 divisors (see below), whose sum is σ = 313653632. Its totient is φ = 156826812.

The previous prime is 235240219. The next prime is 235240241. The reversal of 235240221 is 122042532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 235240221 - 2¹ = 235240219 is a prime.

It is a super-2 number, since 2×235240221² = 110675923152257682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235240241) 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, 39206701 + ... + 39206706.

It is an arithmetic number, because the mean of its divisors is an integer number (78413408).

Almost surely, 2^235240221 is an apocalyptic number.

It is an amenable number.

235240221 is a deficient number, since it is larger than the sum of its proper divisors (78413411).

235240221 is an equidigital number, since it uses as much as digits as its factorization.

235240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78413410.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 235240221 is about 15337.5428605758. The cubic root of 235240221 is about 617.3107779097.

Adding to 235240221 its reverse (122042532), we get a palindrome (357282753).

The spelling of 235240221 in words is "two hundred thirty-five million, two hundred forty thousand, two hundred twenty-one".