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21219 = 311643
BaseRepresentation
bin101001011100011
31002002220
411023203
51134334
6242123
7115602
oct51343
932086
1021219
1114a40
1210343
139873
147a39
156449
hex52e3

21219 has 8 divisors (see below), whose sum is σ = 30912. Its totient is φ = 12840.

The previous prime is 21211. The next prime is 21221. The reversal of 21219 is 91212.

It is a happy number.

21219 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21219 - 23 = 21211 is a prime.

It is a super-2 number, since 2×212192 = 900491922, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 21198 and 21207.

It is not an unprimeable number, because it can be changed into a prime (21211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289 + ... + 354.

It is an arithmetic number, because the mean of its divisors is an integer number (3864).

221219 is an apocalyptic number.

21219 is a deficient number, since it is larger than the sum of its proper divisors (9693).

21219 is a wasteful number, since it uses less digits than its factorization.

21219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657.

The product of its digits is 36, while the sum is 15.

The square root of 21219 is about 145.6674294412. The cubic root of 21219 is about 27.6848157558.

It can be divided in two parts, 212 and 19, that added together give a triangular number (231 = T21).

The spelling of 21219 in words is "twenty-one thousand, two hundred nineteen".

Divisors: 1 3 11 33 643 1929 7073 21219