221553419 has 2 divisors, whose sum is σ = 221553420. Its totient is φ = 221553418.

The previous prime is 221553361. The next prime is 221553443. The reversal of 221553419 is 914355122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221553419 is a prime.

It is a super-2 number, since 2×221553419² = 98171834941179122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221553019) 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, 110776709 + 110776710.

It is an arithmetic number, because the mean of its divisors is an integer number (110776710).

Almost surely, 2^221553419 is an apocalyptic number.

221553419 is a deficient number, since it is larger than the sum of its proper divisors (1).

221553419 is an equidigital number, since it uses as much as digits as its factorization.

221553419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 221553419 is about 14884.6706043500. The cubic root of 221553419 is about 605.0986056068.

The spelling of 221553419 in words is "two hundred twenty-one million, five hundred fifty-three thousand, four hundred nineteen".