21830000 has 100 divisors (see below), whose sum is σ = 55201080. Its totient is φ = 8352000.

The previous prime is 21829981. The next prime is 21830027. The reversal of 21830000 is 3812.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 369971 + ... + 370029.

Almost surely, 2^21830000 is an apocalyptic number.

21830000 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 21830000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27600540).

21830000 is an abundant number, since it is smaller than the sum of its proper divisors (33371080).

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

21830000 is an equidigital number, since it uses as much as digits as its factorization.

21830000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21830000 is about 4672.2585544895. The cubic root of 21830000 is about 279.4803286196.

Adding to 21830000 its reverse (3812), we get a palindrome (21833812).

The spelling of 21830000 in words is "twenty-one million, eight hundred thirty thousand".