21798600 has 96 divisors (see below), whose sum is σ = 69102720. Its totient is φ = 5681920.

The previous prime is 21798599. The next prime is 21798613. The reversal of 21798600 is 689712.

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, 27814 + ... + 28586.

It is an arithmetic number, because the mean of its divisors is an integer number (719820).

Almost surely, 2^21798600 is an apocalyptic number.

21798600 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 21798600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34551360).

21798600 is an abundant number, since it is smaller than the sum of its proper divisors (47304120).

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

21798600 is a wasteful number, since it uses less digits than its factorization.

21798600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21798600 is about 4668.8970860365. The cubic root of 21798600 is about 279.3462639793.

The spelling of 21798600 in words is "twenty-one million, seven hundred ninety-eight thousand, six hundred".