221424319 has 2 divisors, whose sum is σ = 221424320. Its totient is φ = 221424318.

The previous prime is 221424277. The next prime is 221424331. The reversal of 221424319 is 913424122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221424319 - 2¹⁵ = 221391551 is a prime.

It is a super-2 number, since 2×221424319² = 98057458089227522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221424719) 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, 110712159 + 110712160.

It is an arithmetic number, because the mean of its divisors is an integer number (110712160).

Almost surely, 2^221424319 is an apocalyptic number.

221424319 is a deficient number, since it is larger than the sum of its proper divisors (1).

221424319 is an equidigital number, since it uses as much as digits as its factorization.

221424319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 221424319 is about 14880.3332959984. Note that the first 3 decimals coincide. The cubic root of 221424319 is about 604.9810517026.

The spelling of 221424319 in words is "two hundred twenty-one million, four hundred twenty-four thousand, three hundred nineteen".