219921349 has 2 divisors, whose sum is σ = 219921350. Its totient is φ = 219921348.

The previous prime is 219921341. The next prime is 219921353. The reversal of 219921349 is 943129912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201129124 + 18792225 = 14182^2 + 4335^2 .

It is a cyclic number.

It is not a de Polignac number, because 219921349 - 2³ = 219921341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219921341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109960674 + 109960675.

It is an arithmetic number, because the mean of its divisors is an integer number (109960675).

Almost surely, 2^219921349 is an apocalyptic number.

It is an amenable number.

219921349 is a deficient number, since it is larger than the sum of its proper divisors (1).

219921349 is an equidigital number, since it uses as much as digits as its factorization.

219921349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 219921349 is about 14829.7454125147. The cubic root of 219921349 is about 603.6091255292.

The spelling of 219921349 in words is "two hundred nineteen million, nine hundred twenty-one thousand, three hundred forty-nine".