221118829 has 2 divisors, whose sum is σ = 221118830. Its totient is φ = 221118828.

The previous prime is 221118797. The next prime is 221118853. The reversal of 221118829 is 928811122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147622500 + 73496329 = 12150^2 + 8573^2 .

It is a cyclic number.

It is not a de Polignac number, because 221118829 - 2⁵ = 221118797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221118794 and 221118803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221118869) 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, 110559414 + 110559415.

It is an arithmetic number, because the mean of its divisors is an integer number (110559415).

Almost surely, 2^221118829 is an apocalyptic number.

It is an amenable number.

221118829 is a deficient number, since it is larger than the sum of its proper divisors (1).

221118829 is an equidigital number, since it uses as much as digits as its factorization.

221118829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 34.

The square root of 221118829 is about 14870.0648619971. The cubic root of 221118829 is about 604.7027011858.

The spelling of 221118829 in words is "two hundred twenty-one million, one hundred eighteen thousand, eight hundred twenty-nine".