221362705 has 4 divisors (see below), whose sum is σ = 265635252. Its totient is φ = 177090160.

The previous prime is 221362699. The next prime is 221362709. The reversal of 221362705 is 507263122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507263122 = 2 ⋅253631561.

It can be written as a sum of positive squares in 2 ways, for example, as 66210769 + 155151936 = 8137^2 + 12456^2 .

It is not a de Polignac number, because 221362705 - 2¹⁵ = 221329937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221362709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22136266 + ... + 22136275.

It is an arithmetic number, because the mean of its divisors is an integer number (66408813).

Almost surely, 2^221362705 is an apocalyptic number.

It is an amenable number.

221362705 is a deficient number, since it is larger than the sum of its proper divisors (44272547).

221362705 is an equidigital number, since it uses as much as digits as its factorization.

221362705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44272546.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 221362705 is about 14878.2628354254. The cubic root of 221362705 is about 604.9249320607.

The spelling of 221362705 in words is "two hundred twenty-one million, three hundred sixty-two thousand, seven hundred five".