221152081 has 2 divisors, whose sum is σ = 221152082. Its totient is φ = 221152080.

The previous prime is 221152067. The next prime is 221152111. The reversal of 221152081 is 180251122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196560400 + 24591681 = 14020^2 + 4959^2 .

It is a cyclic number.

It is not a de Polignac number, because 221152081 - 2⁹ = 221151569 is a prime.

It is a super-2 number, since 2×221152081² = 97816485861261122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221152681) 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 as a sum of consecutive naturals, namely, 110576040 + 110576041.

It is an arithmetic number, because the mean of its divisors is an integer number (110576041).

Almost surely, 2^221152081 is an apocalyptic number.

It is an amenable number.

221152081 is a deficient number, since it is larger than the sum of its proper divisors (1).

221152081 is an equidigital number, since it uses as much as digits as its factorization.

221152081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 221152081 is about 14871.1829052029. The cubic root of 221152081 is about 604.7330115344.

The spelling of 221152081 in words is "two hundred twenty-one million, one hundred fifty-two thousand, eighty-one".