221145235 has 4 divisors (see below), whose sum is σ = 265374288. Its totient is φ = 176916184.

The previous prime is 221145233. The next prime is 221145269. The reversal of 221145235 is 532541122.

221145235 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 532541122 = 2 ⋅266270561.

It is a cyclic number.

It is not a de Polignac number, because 221145235 - 2¹ = 221145233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221145233) 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, 22114519 + ... + 22114528.

It is an arithmetic number, because the mean of its divisors is an integer number (66343572).

Almost surely, 2^221145235 is an apocalyptic number.

221145235 is a deficient number, since it is larger than the sum of its proper divisors (44229053).

221145235 is an equidigital number, since it uses as much as digits as its factorization.

221145235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44229052.

The product of its digits is 2400, while the sum is 25.

The square root of 221145235 is about 14870.9527267085. The cubic root of 221145235 is about 604.7267714169.

Adding to 221145235 its reverse (532541122), we get a palindrome (753686357).

The spelling of 221145235 in words is "two hundred twenty-one million, one hundred forty-five thousand, two hundred thirty-five".