221249 has 4 divisors (see below), whose sum is σ = 252864. Its totient is φ = 189636.

The previous prime is 221239. The next prime is 221251. The reversal of 221249 is 942122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 942122 = 2 ⋅471061.

It is a cyclic number.

It is not a de Polignac number, because 221249 - 2⁴ = 221233 is a prime.

It is a super-2 number, since 2×221249² = 97902240002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221249.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221249.

It is not an unprimeable number, because it can be changed into a prime (221209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15797 + ... + 15810.

It is an arithmetic number, because the mean of its divisors is an integer number (63216).

2²²¹²⁴⁹ is an apocalyptic number.

It is an amenable number.

221249 is a deficient number, since it is larger than the sum of its proper divisors (31615).

221249 is an equidigital number, since it uses as much as digits as its factorization.

221249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31614.

The product of its digits is 288, while the sum is 20.

The square root of 221249 is about 470.3711300665. The cubic root of 221249 is about 60.4821339227.

The spelling of 221249 in words is "two hundred twenty-one thousand, two hundred forty-nine".