21194800 has 60 divisors (see below), whose sum is σ = 55561176. Its totient is φ = 7705600.

The previous prime is 21194783. The next prime is 21194819. The reversal of 21194800 is 849112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1992 + ... + 6808.

Almost surely, 2^21194800 is an apocalyptic number.

21194800 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 21194800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27780588).

21194800 is an abundant number, since it is smaller than the sum of its proper divisors (34366376).

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

21194800 is a wasteful number, since it uses less digits than its factorization.

21194800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4846 (or 4835 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21194800 is about 4603.7810547419. The cubic root of 21194800 is about 276.7428702527.

The spelling of 21194800 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred".