221203061 has 2 divisors, whose sum is σ = 221203062. Its totient is φ = 221203060.

The previous prime is 221203049. The next prime is 221203069. The reversal of 221203061 is 160302122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192376900 + 28826161 = 13870^2 + 5369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221203061 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221203069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601530 + 110601531.

It is an arithmetic number, because the mean of its divisors is an integer number (110601531).

Almost surely, 2^221203061 is an apocalyptic number.

It is an amenable number.

221203061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221203061 is an equidigital number, since it uses as much as digits as its factorization.

221203061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 221203061 is about 14872.8968597244. The cubic root of 221203061 is about 604.7794756692.

Adding to 221203061 its reverse (160302122), we get a palindrome (381505183).

The spelling of 221203061 in words is "two hundred twenty-one million, two hundred three thousand, sixty-one".