221071849 has 2 divisors, whose sum is σ = 221071850. Its totient is φ = 221071848.

The previous prime is 221071811. The next prime is 221071853. The reversal of 221071849 is 948170122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118657449 + 102414400 = 10893^2 + 10120^2 .

It is a cyclic number.

It is not a de Polignac number, because 221071849 - 2¹¹ = 221069801 is a prime.

It is not a weakly prime, because it can be changed into another prime (221071889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110535924 + 110535925.

It is an arithmetic number, because the mean of its divisors is an integer number (110535925).

Almost surely, 2^221071849 is an apocalyptic number.

It is an amenable number.

221071849 is a deficient number, since it is larger than the sum of its proper divisors (1).

221071849 is an equidigital number, since it uses as much as digits as its factorization.

221071849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 221071849 is about 14868.4850943195. The cubic root of 221071849 is about 604.6598721103.

The spelling of 221071849 in words is "two hundred twenty-one million, seventy-one thousand, eight hundred forty-nine".