221132081 has 4 divisors (see below), whose sum is σ = 221887092. Its totient is φ = 220377072.

The previous prime is 221132077. The next prime is 221132117. The reversal of 221132081 is 180231122.

221132081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212693056 + 8439025 = 14584^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 221132081 - 2² = 221132077 is a prime.

It is a super-2 number, since 2×221132081² = 97798794494781122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221132071) 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, 377066 + ... + 377651.

It is an arithmetic number, because the mean of its divisors is an integer number (55471773).

Almost surely, 2^221132081 is an apocalyptic number.

It is an amenable number.

221132081 is a deficient number, since it is larger than the sum of its proper divisors (755011).

221132081 is an equidigital number, since it uses as much as digits as its factorization.

221132081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755010.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 221132081 is about 14870.5104485354. The cubic root of 221132081 is about 604.7147812066.

The spelling of 221132081 in words is "two hundred twenty-one million, one hundred thirty-two thousand, eighty-one".