221311193 has 2 divisors, whose sum is σ = 221311194. Its totient is φ = 221311192.

The previous prime is 221311169. The next prime is 221311217. The reversal of 221311193 is 391113122.

221311193 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (221311169) and next prime (221311217).

It can be written as a sum of positive squares in only one way, i.e., 132894784 + 88416409 = 11528^2 + 9403^2 .

It is a cyclic number.

It is not a de Polignac number, because 221311193 - 2¹⁶ = 221245657 is a prime.

It is not a weakly prime, because it can be changed into another prime (221311163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110655596 + 110655597.

It is an arithmetic number, because the mean of its divisors is an integer number (110655597).

Almost surely, 2^221311193 is an apocalyptic number.

It is an amenable number.

221311193 is a deficient number, since it is larger than the sum of its proper divisors (1).

221311193 is an equidigital number, since it uses as much as digits as its factorization.

221311193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 221311193 is about 14876.5316186267. The cubic root of 221311193 is about 604.8780055915.

The spelling of 221311193 in words is "two hundred twenty-one million, three hundred eleven thousand, one hundred ninety-three".