221393 has 2 divisors, whose sum is σ = 221394. Its totient is φ = 221392.

The previous prime is 221327. The next prime is 221399. The reversal of 221393 is 393122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208849 + 12544 = 457^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 221393 - 2¹⁰ = 220369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110696 + 110697.

It is an arithmetic number, because the mean of its divisors is an integer number (110697).

2²²¹³⁹³ is an apocalyptic number.

It is an amenable number.

221393 is a deficient number, since it is larger than the sum of its proper divisors (1).

221393 is an equidigital number, since it uses as much as digits as its factorization.

221393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 221393 is about 470.5241757870. The cubic root of 221393 is about 60.4952526840.

The spelling of 221393 in words is "two hundred twenty-one thousand, three hundred ninety-three".