221080005 has 24 divisors (see below), whose sum is σ = 387518040. Its totient is φ = 116582400.

The previous prime is 221080001. The next prime is 221080007. The reversal of 221080005 is 500080122.

It can be written as a sum of positive squares in 4 ways, for example, as 4901796 + 216178209 = 2214^2 + 14703^2 .

It is not a de Polignac number, because 221080005 - 2² = 221080001 is a prime.

It is a super-2 number, since 2×221080005² = 97752737221600050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221080005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221080001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23596 + ... + 31605.

It is an arithmetic number, because the mean of its divisors is an integer number (16146585).

Almost surely, 2^221080005 is an apocalyptic number.

It is an amenable number.

221080005 is a deficient number, since it is larger than the sum of its proper divisors (166438035).

221080005 is a wasteful number, since it uses less digits than its factorization.

221080005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55301 (or 55298 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221080005 is about 14868.7593631749. The cubic root of 221080005 is about 604.6673079210.

It can be divided in two parts, 2210 and 80005, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 221080005 in words is "two hundred twenty-one million, eighty thousand, five".