21260 has 12 divisors (see below), whose sum is σ = 44688. Its totient is φ = 8496.

The previous prime is 21247. The next prime is 21269. The reversal of 21260 is 6212.

21260 = 48² + 49² + ... + 55².

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21260.

It is not an unprimeable number, because it can be changed into a prime (21269) 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, 512 + ... + 551.

It is an arithmetic number, because the mean of its divisors is an integer number (3724).

2²¹²⁶⁰ is an apocalyptic number.

21260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21260 is an abundant number, since it is smaller than the sum of its proper divisors (23428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22344).

21260 is a wasteful number, since it uses less digits than its factorization.

21260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21260 is about 145.8080930538. The cubic root of 21260 is about 27.7026354324.

Adding to 21260 its reverse (6212), we get a palindrome (27472).

It can be divided in two parts, 212 and 60, that multiplied together give a triangular number (12720 = T₁₅₉).

The spelling of 21260 in words is "twenty-one thousand, two hundred sixty".