21088760 has 128 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 6374400.

The previous prime is 21088747. The next prime is 21088763. The reversal of 21088760 is 6788012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088763) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126197 + ... + 126363.

It is an arithmetic number, because the mean of its divisors is an integer number (476280).

Almost surely, 2^21088760 is an apocalyptic number.

21088760 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 21088760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

21088760 is an abundant number, since it is smaller than the sum of its proper divisors (39875080).

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

21088760 is a wasteful number, since it uses less digits than its factorization.

21088760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 21088760 is about 4592.2499931951. The cubic root of 21088760 is about 276.2805730446.

The spelling of 21088760 in words is "twenty-one million, eighty-eight thousand, seven hundred sixty".