221919 has 4 divisors (see below), whose sum is σ = 295896. Its totient is φ = 147944.

The previous prime is 221909. The next prime is 221941. The reversal of 221919 is 919122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221919 - 2¹¹ = 219871 is a prime.

It is a super-2 number, since 2×221919² = 98496085122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221909) 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, 36984 + ... + 36989.

It is an arithmetic number, because the mean of its divisors is an integer number (73974).

2²²¹⁹¹⁹ is an apocalyptic number.

221919 is a deficient number, since it is larger than the sum of its proper divisors (73977).

221919 is an equidigital number, since it uses as much as digits as its factorization.

221919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73976.

The product of its digits is 324, while the sum is 24.

The square root of 221919 is about 471.0827952706. The cubic root of 221919 is about 60.5431243206.

The spelling of 221919 in words is "two hundred twenty-one thousand, nine hundred nineteen".