21096600 has 96 divisors (see below), whose sum is σ = 74757120. Its totient is φ = 4821120.

The previous prime is 21096599. The next prime is 21096611. The reversal of 21096600 is 669012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 1689 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (778720).

Almost surely, 2^21096600 is an apocalyptic number.

21096600 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 21096600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37378560).

21096600 is an abundant number, since it is smaller than the sum of its proper divisors (53660520).

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

21096600 is a wasteful number, since it uses less digits than its factorization.

21096600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049 (or 5040 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21096600 is about 4593.1035259397. The cubic root of 21096600 is about 276.3148056774.

The spelling of 21096600 in words is "twenty-one million, ninety-six thousand, six hundred".