221941 has 2 divisors, whose sum is σ = 221942. Its totient is φ = 221940.

The previous prime is 221909. The next prime is 221951. The reversal of 221941 is 149122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221841 + 100 = 471^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 221941 - 2⁵ = 221909 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110970 + 110971.

It is an arithmetic number, because the mean of its divisors is an integer number (110971).

2²²¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

221941 is a deficient number, since it is larger than the sum of its proper divisors (1).

221941 is an equidigital number, since it uses as much as digits as its factorization.

221941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 221941 is about 471.1061451520. The cubic root of 221941 is about 60.5451249074.

The spelling of 221941 in words is "two hundred twenty-one thousand, nine hundred forty-one".