21412560 has 80 divisors (see below), whose sum is σ = 71495424. Its totient is φ = 5270016.

The previous prime is 21412549. The next prime is 21412561. The reversal of 21412560 is 6521412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312 + ... + 6551.

Almost surely, 2^21412560 is an apocalyptic number.

21412560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21412560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35747712).

21412560 is an abundant number, since it is smaller than the sum of its proper divisors (50082864).

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

21412560 is a wasteful number, since it uses less digits than its factorization.

21412560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892 (or 6886 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21412560 is about 4627.3707437377. The cubic root of 21412560 is about 277.6874149928.

Adding to 21412560 its reverse (6521412), we get a palindrome (27933972).

It can be divided in two parts, 214125 and 60, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 21412560 in words is "twenty-one million, four hundred twelve thousand, five hundred sixty".