221255543 has 2 divisors, whose sum is σ = 221255544. Its totient is φ = 221255542.

The previous prime is 221255521. The next prime is 221255569. The reversal of 221255543 is 345552122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221255543 - 2¹⁶ = 221190007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221251543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110627771 + 110627772.

It is an arithmetic number, because the mean of its divisors is an integer number (110627772).

Almost surely, 2^221255543 is an apocalyptic number.

221255543 is a deficient number, since it is larger than the sum of its proper divisors (1).

221255543 is an equidigital number, since it uses as much as digits as its factorization.

221255543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 29.

The square root of 221255543 is about 14874.6611053832. The cubic root of 221255543 is about 604.8273012982.

The spelling of 221255543 in words is "two hundred twenty-one million, two hundred fifty-five thousand, five hundred forty-three".