221272717 has 2 divisors, whose sum is σ = 221272718. Its totient is φ = 221272716.

The previous prime is 221272703. The next prime is 221272729. The reversal of 221272717 is 717272122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209120521 + 12152196 = 14461^2 + 3486^2 .

It is a cyclic number.

It is not a de Polignac number, because 221272717 - 2⁷ = 221272589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221272747) 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, 110636358 + 110636359.

It is an arithmetic number, because the mean of its divisors is an integer number (110636359).

Almost surely, 2^221272717 is an apocalyptic number.

It is an amenable number.

221272717 is a deficient number, since it is larger than the sum of its proper divisors (1).

221272717 is an equidigital number, since it uses as much as digits as its factorization.

221272717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5488, while the sum is 31.

The square root of 221272717 is about 14875.2383846445. The cubic root of 221272717 is about 604.8429499236.

The spelling of 221272717 in words is "two hundred twenty-one million, two hundred seventy-two thousand, seven hundred seventeen".