21463 has 6 divisors (see below), whose sum is σ = 23424. Its totient is φ = 19656.

The previous prime is 21433. The next prime is 21467. The reversal of 21463 is 36412.

It is a de Polignac number, because none of the positive numbers 2^k-21463 is a prime.

It is the 147-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21467) by changing a digit.

It is a nontrivial repunit in base 146.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106 + ... + 232.

It is an arithmetic number, because the mean of its divisors is an integer number (3904).

2²¹⁴⁶³ is an apocalyptic number.

21463 is a deficient number, since it is larger than the sum of its proper divisors (1961).

21463 is a wasteful number, since it uses less digits than its factorization.

21463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 140 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 21463 is about 146.5025597046. The cubic root of 21463 is about 27.7905286646.

Adding to 21463 its reverse (36412), we get a palindrome (57875).

It can be divided in two parts, 21 and 463, that added together give a palindrome (484).

The spelling of 21463 in words is "twenty-one thousand, four hundred sixty-three".