221011243 has 2 divisors, whose sum is σ = 221011244. Its totient is φ = 221011242.

The previous prime is 221011201. The next prime is 221011267. The reversal of 221011243 is 342110122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221011243 - 2¹⁷ = 220880171 is a prime.

It is not a weakly prime, because it can be changed into another prime (221011283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505621 + 110505622.

It is an arithmetic number, because the mean of its divisors is an integer number (110505622).

Almost surely, 2^221011243 is an apocalyptic number.

221011243 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011243 is an equidigital number, since it uses as much as digits as its factorization.

221011243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221011243 is about 14866.4468855204. The cubic root of 221011243 is about 604.6046119981.

Adding to 221011243 its reverse (342110122), we get a palindrome (563121365).

The spelling of 221011243 in words is "two hundred twenty-one million, eleven thousand, two hundred forty-three".