21324760 has 64 divisors (see below), whose sum is σ = 49816800. Its totient is φ = 8211456.

The previous prime is 21324739. The next prime is 21324761. The reversal of 21324760 is 6742312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324761) 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, 195586 + ... + 195694.

Almost surely, 2^21324760 is an apocalyptic number.

21324760 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 21324760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24908400).

21324760 is an abundant number, since it is smaller than the sum of its proper divisors (28492040).

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

21324760 is a wasteful number, since it uses less digits than its factorization.

21324760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21324760 is about 4617.8739696964. The cubic root of 21324760 is about 277.3073521540.

The spelling of 21324760 in words is "twenty-one million, three hundred twenty-four thousand, seven hundred sixty".