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21452 = 2231173
BaseRepresentation
bin101001111001100
31002102112
411033030
51141302
6243152
7116354
oct51714
932375
1021452
1115132
12104b8
1399c2
147b64
156552
hex53cc

21452 has 12 divisors (see below), whose sum is σ = 38976. Its totient is φ = 10320.

The previous prime is 21433. The next prime is 21467. The reversal of 21452 is 25412.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 15.

It is an unprimeable number.

21452 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 210.

It is an arithmetic number, because the mean of its divisors is an integer number (3248).

221452 is an apocalyptic number.

It is an amenable number.

21452 is a deficient number, since it is larger than the sum of its proper divisors (17524).

21452 is a wasteful number, since it uses less digits than its factorization.

21452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 206 counting only the distinct ones).

The product of its digits is 80, while the sum is 14.

The square root of 21452 is about 146.4650128870. The cubic root of 21452 is about 27.7857802129.

Adding to 21452 its reverse (25412), we get a palindrome (46864).

The spelling of 21452 in words is "twenty-one thousand, four hundred fifty-two".

Divisors: 1 2 4 31 62 124 173 346 692 5363 10726 21452