21098300 has 54 divisors (see below), whose sum is σ = 47465712. Its totient is φ = 8136480.

The previous prime is 21098269. The next prime is 21098327. The reversal of 21098300 is 389012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 314867 + ... + 314933.

Almost surely, 2^21098300 is an apocalyptic number.

21098300 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 21098300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23732856).

21098300 is an abundant number, since it is smaller than the sum of its proper divisors (26367412).

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

21098300 is a wasteful number, since it uses less digits than its factorization.

21098300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21098300 is about 4593.2885822687. The cubic root of 21098300 is about 276.3222274507.

The spelling of 21098300 in words is "twenty-one million, ninety-eight thousand, three hundred".