221065135 has 4 divisors (see below), whose sum is σ = 265278168. Its totient is φ = 176852104.

The previous prime is 221065129. The next prime is 221065139. The reversal of 221065135 is 531560122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221065135 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221065139) 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, 22106509 + ... + 22106518.

It is an arithmetic number, because the mean of its divisors is an integer number (66319542).

Almost surely, 2^221065135 is an apocalyptic number.

221065135 is a deficient number, since it is larger than the sum of its proper divisors (44213033).

221065135 is an equidigital number, since it uses as much as digits as its factorization.

221065135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44213032.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 221065135 is about 14868.2593130467. The cubic root of 221065135 is about 604.6537508311.

The spelling of 221065135 in words is "two hundred twenty-one million, sixty-five thousand, one hundred thirty-five".