221082077 has 4 divisors (see below), whose sum is σ = 221715900. Its totient is φ = 220448256.

The previous prime is 221082061. The next prime is 221082083. The reversal of 221082077 is 770280122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 194156356 + 26925721 = 13934^2 + 5189^2 .

It is a cyclic number.

It is not a de Polignac number, because 221082077 - 2⁴ = 221082061 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 (221082007) 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, 316388 + ... + 317085.

It is an arithmetic number, because the mean of its divisors is an integer number (55428975).

Almost surely, 2^221082077 is an apocalyptic number.

It is an amenable number.

221082077 is a deficient number, since it is larger than the sum of its proper divisors (633823).

221082077 is an equidigital number, since it uses as much as digits as its factorization.

221082077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633822.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 221082077 is about 14868.8290393023. The cubic root of 221082077 is about 604.6691969306.

The spelling of 221082077 in words is "two hundred twenty-one million, eighty-two thousand, seventy-seven".