219421 has 4 divisors (see below), whose sum is σ = 223200. Its totient is φ = 215644.

The previous prime is 219409. The next prime is 219433. The reversal of 219421 is 124912.

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.

It is an interprime number because it is at equal distance from previous prime (219409) and next prime (219433).

It is a cyclic number.

It is not a de Polignac number, because 219421 - 2⁵ = 219389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219451) 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, 1801 + ... + 1918.

It is an arithmetic number, because the mean of its divisors is an integer number (55800).

2²¹⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

219421 is a deficient number, since it is larger than the sum of its proper divisors (3779).

219421 is an equidigital number, since it uses as much as digits as its factorization.

219421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778.

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

The square root of 219421 is about 468.4239532731. The cubic root of 219421 is about 60.3151015460.

The spelling of 219421 in words is "two hundred nineteen thousand, four hundred twenty-one".