221165027 has 4 divisors (see below), whose sum is σ = 221200800. Its totient is φ = 221129256.

The previous prime is 221165023. The next prime is 221165047. The reversal of 221165027 is 720561122.

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

It is a cyclic number.

It is not a de Polignac number, because 221165027 - 2² = 221165023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221164987 and 221165005.

It is not an unprimeable number, because it can be changed into a prime (221165023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5963 + ... + 21860.

It is an arithmetic number, because the mean of its divisors is an integer number (55300200).

Almost surely, 2^221165027 is an apocalyptic number.

221165027 is a deficient number, since it is larger than the sum of its proper divisors (35773).

221165027 is an equidigital number, since it uses as much as digits as its factorization.

221165027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35772.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 221165027 is about 14871.6181701925. The cubic root of 221165027 is about 604.7448114397.

The spelling of 221165027 in words is "two hundred twenty-one million, one hundred sixty-five thousand, twenty-seven".