21835000 has 80 divisors (see below), whose sum is σ = 55950840. Its totient is φ = 7920000.

The previous prime is 21834997. The next prime is 21835007. The reversal of 21835000 is 53812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 54802 + ... + 55198.

Almost surely, 2^21835000 is an apocalyptic number.

21835000 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 21835000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27975420).

21835000 is an abundant number, since it is smaller than the sum of its proper divisors (34115840).

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

21835000 is a wasteful number, since it uses less digits than its factorization.

21835000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21835000 is about 4672.7935969824. The cubic root of 21835000 is about 279.5016646246.

Adding to 21835000 its reverse (53812), we get a palindrome (21888812).

The spelling of 21835000 in words is "twenty-one million, eight hundred thirty-five thousand".