21098600 has 96 divisors (see below), whose sum is σ = 52496640. Its totient is φ = 7872000.

The previous prime is 21098591. The next prime is 21098617. The reversal of 21098600 is 689012.

It is a self number, because there is not a number n which added to its sum of digits gives 21098600.

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, 254159 + ... + 254241.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^21098600 is an apocalyptic number.

21098600 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 21098600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26248320).

21098600 is an abundant number, since it is smaller than the sum of its proper divisors (31398040).

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

21098600 is a wasteful number, since it uses less digits than its factorization.

21098600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21098600 is about 4593.3212384940. The cubic root of 21098600 is about 276.3235371341.

The spelling of 21098600 in words is "twenty-one million, ninety-eight thousand, six hundred".