21496680 has 96 divisors (see below), whose sum is σ = 70443360. Its totient is φ = 5685120.

The previous prime is 21496679. The next prime is 21496703. The reversal of 21496680 is 8669412.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75819 + ... + 76101.

It is an arithmetic number, because the mean of its divisors is an integer number (733785).

Almost surely, 2^21496680 is an apocalyptic number.

21496680 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 21496680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35221680).

21496680 is an abundant number, since it is smaller than the sum of its proper divisors (48946680).

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

21496680 is a wasteful number, since it uses less digits than its factorization.

21496680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 21496680 is about 4636.4512291191. The cubic root of 21496680 is about 278.0505747919.

The spelling of 21496680 in words is "twenty-one million, four hundred ninety-six thousand, six hundred eighty".