221660113 has 2 divisors, whose sum is σ = 221660114. Its totient is φ = 221660112.

The previous prime is 221660077. The next prime is 221660129. The reversal of 221660113 is 311066122.

221660113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221652544 + 7569 = 14888^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 221660113 - 2¹³ = 221651921 is a prime.

It is not a weakly prime, because it can be changed into another prime (221660183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110830056 + 110830057.

It is an arithmetic number, because the mean of its divisors is an integer number (110830057).

Almost surely, 2^221660113 is an apocalyptic number.

It is an amenable number.

221660113 is a deficient number, since it is larger than the sum of its proper divisors (1).

221660113 is an equidigital number, since it uses as much as digits as its factorization.

221660113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221660113 is about 14888.2541958418. The cubic root of 221660113 is about 605.1957229374.

The spelling of 221660113 in words is "two hundred twenty-one million, six hundred sixty thousand, one hundred thirteen".