21326760 has 384 divisors, whose sum is σ = 91929600. Its totient is φ = 4354560.

The previous prime is 21326749. The next prime is 21326771. The reversal of 21326760 is 6762312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21326749) and next prime (21326771).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 687945 + ... + 687975.

It is an arithmetic number, because the mean of its divisors is an integer number (239400).

Almost surely, 2^21326760 is an apocalyptic number.

21326760 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 21326760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45964800).

21326760 is an abundant number, since it is smaller than the sum of its proper divisors (70602840).

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

21326760 is a wasteful number, since it uses less digits than its factorization.

21326760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21326760 is about 4618.0905144876. The cubic root of 21326760 is about 277.3160212217.

The spelling of 21326760 in words is "twenty-one million, three hundred twenty-six thousand, seven hundred sixty".