221944829 has 2 divisors, whose sum is σ = 221944830. Its totient is φ = 221944828.

The previous prime is 221944817. The next prime is 221944861. The reversal of 221944829 is 928449122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142324900 + 79619929 = 11930^2 + 8923^2 .

It is a cyclic number.

It is not a de Polignac number, because 221944829 - 2⁴ = 221944813 is a prime.

It is a Chen prime.

It is a nialpdrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221949829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110972414 + 110972415.

It is an arithmetic number, because the mean of its divisors is an integer number (110972415).

Almost surely, 2^221944829 is an apocalyptic number.

It is an amenable number.

221944829 is a deficient number, since it is larger than the sum of its proper divisors (1).

221944829 is an equidigital number, since it uses as much as digits as its factorization.

221944829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 221944829 is about 14897.8128931733. The cubic root of 221944829 is about 605.4547308699.

The spelling of 221944829 in words is "two hundred twenty-one million, nine hundred forty-four thousand, eight hundred twenty-nine".