221724241 has 2 divisors, whose sum is σ = 221724242. Its totient is φ = 221724240.

The previous prime is 221724229. The next prime is 221724247. The reversal of 221724241 is 142427122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221146641 + 577600 = 14871^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 221724241 - 2¹⁵ = 221691473 is a prime.

It is not a weakly prime, because it can be changed into another prime (221724247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110862120 + 110862121.

It is an arithmetic number, because the mean of its divisors is an integer number (110862121).

Almost surely, 2^221724241 is an apocalyptic number.

It is an amenable number.

221724241 is a deficient number, since it is larger than the sum of its proper divisors (1).

221724241 is an equidigital number, since it uses as much as digits as its factorization.

221724241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 25.

The square root of 221724241 is about 14890.4076841435. The cubic root of 221724241 is about 605.2540799247.

The spelling of 221724241 in words is "two hundred twenty-one million, seven hundred twenty-four thousand, two hundred forty-one".